November 29, 2023
What’s the state of smog pollution where you live?
Smog — also known as ground-level ozone — can trigger asthma attacks and increase the risk of heart and lung diseases. Many areas lack air monitors. Rigorous monitoring is critical for protecting public health. Read the full story.
The Smog Standard: Measures average smog levels over 8-hour periods. Currently set at 70 parts per billion. In 2023, all but one of the EPA’s 18 independent scientific experts recommended that the agency strengthen the smog standard to 55–60ppb.
| Alabama | Autauga County | No air monitoring |
| Alabama | Baldwin County | 58ppb |
| Alabama | Barbour County | No air monitoring |
| Alabama | Bibb County | No air monitoring |
| Alabama | Blount County | No air monitoring |
| Alabama | Bullock County | No air monitoring |
| Alabama | Butler County | No air monitoring |
| Alabama | Calhoun County | No air monitoring |
| Alabama | Chambers County | No air monitoring |
| Alabama | Cherokee County | No air monitoring |
| Alabama | Chilton County | No air monitoring |
| Alabama | Choctaw County | No air monitoring |
| Alabama | Clarke County | No air monitoring |
| Alabama | Clay County | No air monitoring |
| Alabama | Cleburne County | No air monitoring |
| Alabama | Coffee County | No air monitoring |
| Alabama | Colbert County | No air monitoring |
| Alabama | Conecuh County | No air monitoring |
| Alabama | Coosa County | No air monitoring |
| Alabama | Covington County | No air monitoring |
| Alabama | Crenshaw County | No air monitoring |
| Alabama | Cullman County | No air monitoring |
| Alabama | Dale County | No air monitoring |
| Alabama | Dallas County | No air monitoring |
| Alabama | DeKalb County | 58ppb |
| Alabama | Elmore County | 53ppb |
| Alabama | Escambia County | No air monitoring |
| Alabama | Etowah County | 57ppb |
| Alabama | Fayette County | No air monitoring |
| Alabama | Franklin County | No air monitoring |
| Alabama | Geneva County | No air monitoring |
| Alabama | Greene County | No air monitoring |
| Alabama | Hale County | No air monitoring |
| Alabama | Henry County | No air monitoring |
| Alabama | Houston County | No air monitoring |
| Alabama | Jackson County | No air monitoring |
| Alabama | Jefferson County | 63ppb |
| Alabama | Lamar County | No air monitoring |
| Alabama | Lauderdale County | No air monitoring |
| Alabama | Lawrence County | No air monitoring |
| Alabama | Lee County | No air monitoring |
| Alabama | Limestone County | No air monitoring |
| Alabama | Lowndes County | No air monitoring |
| Alabama | Macon County | No air monitoring |
| Alabama | Madison County | 61ppb |
| Alabama | Marengo County | No air monitoring |
| Alabama | Marion County | No air monitoring |
| Alabama | Marshall County | No air monitoring |
| Alabama | Mobile County | 57ppb |
| Alabama | Monroe County | No air monitoring |
| Alabama | Montgomery County | 58ppb |
| Alabama | Morgan County | 60ppb |
| Alabama | Perry County | No air monitoring |
| Alabama | Pickens County | No air monitoring |
| Alabama | Pike County | No air monitoring |
| Alabama | Randolph County | No air monitoring |
| Alabama | Russell County | 57ppb |
| Alabama | St. Clair County | No air monitoring |
| Alabama | Shelby County | 61ppb |
| Alabama | Sumter County | 53ppb |
| Alabama | Talladega County | No air monitoring |
| Alabama | Tallapoosa County | No air monitoring |
| Alabama | Tuscaloosa County | 55ppb |
| Alabama | Walker County | No air monitoring |
| Alabama | Washington County | No air monitoring |
| Alabama | Wilcox County | No air monitoring |
| Alabama | Winston County | No air monitoring |
| Alaska | Aleutians East Borough | No air monitoring |
| Alaska | Aleutians West Census Area | No air monitoring |
| Alaska | Anchorage Borough | No air monitoring |
| Alaska | Bethel Census Area | No air monitoring |
| Alaska | Bristol Bay Borough | No air monitoring |
| Alaska | Denali Borough | 53ppb |
| Alaska | Dillingham Census Area | No air monitoring |
| Alaska | Fairbanks North Star Borough | No air monitoring |
| Alaska | Haines Borough | No air monitoring |
| Alaska | Juneau Borough | No air monitoring |
| Alaska | Kenai Peninsula Borough | No air monitoring |
| Alaska | Ketchikan Gateway Borough | No air monitoring |
| Alaska | Kodiak Island Borough | No air monitoring |
| Alaska | Lake and Peninsula Borough | No air monitoring |
| Alaska | Matanuska-Susitna Borough | No air monitoring |
| Alaska | Nome Census Area | No air monitoring |
| Alaska | North Slope Borough | No air monitoring |
| Alaska | Northwest Arctic Borough | No air monitoring |
| Alaska | Prince of Wales-Outer Ketchikan Census Area | No air monitoring |
| Alaska | Sitka Borough | No air monitoring |
| Alaska | Skagway-Yakutat-Angoon Census Area | No air monitoring |
| Alaska | Skagway-Hoonah-Angoon Census Area | No air monitoring |
| Alaska | Southeast Fairbanks Census Area | No air monitoring |
| Alaska | Valdez-Cordova Census Area | No air monitoring |
| Alaska | Wade Hampton Census Area | No air monitoring |
| Alaska | Wrangell-Petersburg Census Area | No air monitoring |
| Alaska | Yakutat Borough | No air monitoring |
| Alaska | Yukon-Koyukuk Census Area | No air monitoring |
| Arizona | Apache County | No air monitoring |
| Arizona | Cochise County | 65ppb |
| Arizona | Coconino County | 63ppb |
| Arizona | Gila County | 76ppb |
| Arizona | Graham County | No air monitoring |
| Arizona | Greenlee County | No air monitoring |
| Arizona | La Paz County | 65ppb |
| Arizona | Maricopa County | 81ppb |
| Arizona | Mohave County | No air monitoring |
| Arizona | Navajo County | 66ppb |
| Arizona | Pima County | 70ppb |
| Arizona | Pinal County | 76ppb |
| Arizona | Santa Cruz County | No air monitoring |
| Arizona | Yavapai County | 62ppb |
| Arizona | Yuma County | 68ppb |
| Arkansas | Arkansas County | No air monitoring |
| Arkansas | Ashley County | No air monitoring |
| Arkansas | Baxter County | No air monitoring |
| Arkansas | Benton County | No air monitoring |
| Arkansas | Boone County | No air monitoring |
| Arkansas | Bradley County | No air monitoring |
| Arkansas | Calhoun County | No air monitoring |
| Arkansas | Carroll County | No air monitoring |
| Arkansas | Chicot County | No air monitoring |
| Arkansas | Clark County | 57ppb |
| Arkansas | Clay County | No air monitoring |
| Arkansas | Cleburne County | No air monitoring |
| Arkansas | Cleveland County | No air monitoring |
| Arkansas | Columbia County | No air monitoring |
| Arkansas | Conway County | No air monitoring |
| Arkansas | Craighead County | No air monitoring |
| Arkansas | Crawford County | No air monitoring |
| Arkansas | Crittenden County | 70ppb |
| Arkansas | Cross County | No air monitoring |
| Arkansas | Dallas County | No air monitoring |
| Arkansas | Desha County | No air monitoring |
| Arkansas | Drew County | No air monitoring |
| Arkansas | Faulkner County | No air monitoring |
| Arkansas | Franklin County | No air monitoring |
| Arkansas | Fulton County | No air monitoring |
| Arkansas | Garland County | No air monitoring |
| Arkansas | Grant County | No air monitoring |
| Arkansas | Greene County | No air monitoring |
| Arkansas | Hempstead County | No air monitoring |
| Arkansas | Hot Spring County | No air monitoring |
| Arkansas | Howard County | No air monitoring |
| Arkansas | Independence County | No air monitoring |
| Arkansas | Izard County | No air monitoring |
| Arkansas | Jackson County | No air monitoring |
| Arkansas | Jefferson County | No air monitoring |
| Arkansas | Johnson County | No air monitoring |
| Arkansas | Lafayette County | No air monitoring |
| Arkansas | Lawrence County | No air monitoring |
| Arkansas | Lee County | No air monitoring |
| Arkansas | Lincoln County | No air monitoring |
| Arkansas | Little River County | No air monitoring |
| Arkansas | Logan County | No air monitoring |
| Arkansas | Lonoke County | No air monitoring |
| Arkansas | Madison County | No air monitoring |
| Arkansas | Marion County | No air monitoring |
| Arkansas | Miller County | No air monitoring |
| Arkansas | Mississippi County | No air monitoring |
| Arkansas | Monroe County | No air monitoring |
| Arkansas | Montgomery County | No air monitoring |
| Arkansas | Nevada County | No air monitoring |
| Arkansas | Newton County | 60ppb |
| Arkansas | Ouachita County | No air monitoring |
| Arkansas | Perry County | No air monitoring |
| Arkansas | Phillips County | No air monitoring |
| Arkansas | Pike County | No air monitoring |
| Arkansas | Poinsett County | No air monitoring |
| Arkansas | Polk County | 61ppb |
| Arkansas | Pope County | No air monitoring |
| Arkansas | Prairie County | No air monitoring |
| Arkansas | Pulaski County | 64ppb |
| Arkansas | Randolph County | No air monitoring |
| Arkansas | St. Francis County | No air monitoring |
| Arkansas | Saline County | No air monitoring |
| Arkansas | Scott County | No air monitoring |
| Arkansas | Searcy County | No air monitoring |
| Arkansas | Sebastian County | No air monitoring |
| Arkansas | Sevier County | No air monitoring |
| Arkansas | Sharp County | No air monitoring |
| Arkansas | Stone County | No air monitoring |
| Arkansas | Union County | No air monitoring |
| Arkansas | Van Buren County | No air monitoring |
| Arkansas | Washington County | 62ppb |
| Arkansas | White County | No air monitoring |
| Arkansas | Woodruff County | No air monitoring |
| Arkansas | Yell County | No air monitoring |
| California | Alameda County | 69ppb |
| California | Alpine County | No air monitoring |
| California | Amador County | 66ppb |
| California | Butte County | 71ppb |
| California | Calaveras County | 68ppb |
| California | Colusa County | 56ppb |
| California | Contra Costa County | 69ppb |
| California | Del Norte County | No air monitoring |
| California | El Dorado County | 77ppb |
| California | Fresno County | 84ppb |
| California | Glenn County | 61ppb |
| California | Humboldt County | 38ppb |
| California | Imperial County | 77ppb |
| California | Inyo County | 72ppb |
| California | Kern County | 94ppb |
| California | Kings County | 78ppb |
| California | Lake County | 55ppb |
| California | Lassen County | No air monitoring |
| California | Los Angeles County | 102ppb |
| California | Madera County | 82ppb |
| California | Marin County | 57ppb |
| California | Mariposa County | 83ppb |
| California | Mendocino County | 56ppb |
| California | Merced County | 76ppb |
| California | Modoc County | No air monitoring |
| California | Mono County | No air monitoring |
| California | Monterey County | 57ppb |
| California | Napa County | No air monitoring |
| California | Nevada County | 81ppb |
| California | Orange County | 80ppb |
| California | Placer County | 81ppb |
| California | Plumas County | No air monitoring |
| California | Riverside County | 99ppb |
| California | Sacramento County | 76ppb |
| California | San Benito County | 67ppb |
| California | San Bernardino County | 113ppb |
| California | San Diego County | 79ppb |
| California | San Francisco County | 47ppb |
| California | San Joaquin County | 66ppb |
| California | San Luis Obispo County | 71ppb |
| California | San Mateo County | 55ppb |
| California | Santa Barbara County | 64ppb |
| California | Santa Clara County | 69ppb |
| California | Santa Cruz County | 49ppb |
| California | Shasta County | 68ppb |
| California | Sierra County | No air monitoring |
| California | Siskiyou County | 60ppb |
| California | Solano County | 64ppb |
| California | Sonoma County | 52ppb |
| California | Stanislaus County | 79ppb |
| California | Sutter County | 73ppb |
| California | Tehama County | 73ppb |
| California | Trinity County | No air monitoring |
| California | Tulare County | 91ppb |
| California | Tuolumne County | 66ppb |
| California | Ventura County | 76ppb |
| California | Yolo County | 68ppb |
| California | Yuba County | No air monitoring |
| Colorado | Adams County | 77ppb |
| Colorado | Alamosa County | No air monitoring |
| Colorado | Arapahoe County | 80ppb |
| Colorado | Archuleta County | 64ppb |
| Colorado | Baca County | No air monitoring |
| Colorado | Bent County | No air monitoring |
| Colorado | Boulder County | 76ppb |
| Colorado | Chaffee County | No air monitoring |
| Colorado | Cheyenne County | No air monitoring |
| Colorado | Clear Creek County | No air monitoring |
| Colorado | Conejos County | No air monitoring |
| Colorado | Costilla County | No air monitoring |
| Colorado | Crowley County | No air monitoring |
| Colorado | Custer County | No air monitoring |
| Colorado | Delta County | No air monitoring |
| Colorado | Denver County | 77ppb |
| Colorado | Dolores County | No air monitoring |
| Colorado | Douglas County | 83ppb |
| Colorado | Eagle County | No air monitoring |
| Colorado | Elbert County | No air monitoring |
| Colorado | El Paso County | 74ppb |
| Colorado | Fremont County | No air monitoring |
| Colorado | Garfield County | 62ppb |
| Colorado | Gilpin County | 76ppb |
| Colorado | Grand County | No air monitoring |
| Colorado | Gunnison County | 65ppb |
| Colorado | Hinsdale County | No air monitoring |
| Colorado | Huerfano County | No air monitoring |
| Colorado | Jackson County | No air monitoring |
| Colorado | Jefferson County | 84ppb |
| Colorado | Kiowa County | No air monitoring |
| Colorado | Kit Carson County | No air monitoring |
| Colorado | Lake County | No air monitoring |
| Colorado | La Plata County | 66ppb |
| Colorado | Larimer County | 77ppb |
| Colorado | Las Animas County | No air monitoring |
| Colorado | Lincoln County | No air monitoring |
| Colorado | Logan County | No air monitoring |
| Colorado | Mesa County | 65ppb |
| Colorado | Mineral County | No air monitoring |
| Colorado | Moffat County | No air monitoring |
| Colorado | Montezuma County | 66ppb |
| Colorado | Montrose County | No air monitoring |
| Colorado | Morgan County | No air monitoring |
| Colorado | Otero County | No air monitoring |
| Colorado | Ouray County | No air monitoring |
| Colorado | Park County | No air monitoring |
| Colorado | Phillips County | No air monitoring |
| Colorado | Pitkin County | No air monitoring |
| Colorado | Prowers County | No air monitoring |
| Colorado | Pueblo County | No air monitoring |
| Colorado | Rio Blanco County | 65ppb |
| Colorado | Rio Grande County | No air monitoring |
| Colorado | Routt County | No air monitoring |
| Colorado | Saguache County | No air monitoring |
| Colorado | San Juan County | No air monitoring |
| Colorado | San Miguel County | No air monitoring |
| Colorado | Sedgwick County | No air monitoring |
| Colorado | Summit County | No air monitoring |
| Colorado | Teller County | No air monitoring |
| Colorado | Washington County | No air monitoring |
| Colorado | Weld County | 77ppb |
| Colorado | Yuma County | No air monitoring |
| Connecticut | Fairfield County | 81ppb |
| Connecticut | Hartford County | 68ppb |
| Connecticut | Litchfield County | 67ppb |
| Connecticut | Middlesex County | 73ppb |
| Connecticut | New Haven County | 79ppb |
| Connecticut | New London County | 72ppb |
| Connecticut | Tolland County | 66ppb |
| Connecticut | Windham County | 64ppb |
| Delaware | Kent County | No air monitoring |
| Delaware | New Castle County | No air monitoring |
| Delaware | Sussex County | No air monitoring |
| District of Columbia | District of Columbia | No air monitoring |
| District of Columbia | District of Columbia | 67ppb |
| Florida | Alachua County | 58ppb |
| Florida | Baker County | 58ppb |
| Florida | Bay County | 57ppb |
| Florida | Bradford County | No air monitoring |
| Florida | Brevard County | 59ppb |
| Florida | Broward County | 59ppb |
| Florida | Calhoun County | No air monitoring |
| Florida | Charlotte County | No air monitoring |
| Florida | Citrus County | No air monitoring |
| Florida | Clay County | No air monitoring |
| Florida | Collier County | 56ppb |
| Florida | Columbia County | No air monitoring |
| Florida | Dade County | No air monitoring |
| Florida | DeSoto County | No air monitoring |
| Florida | Dixie County | No air monitoring |
| Florida | Duval County | 60ppb |
| Florida | Escambia County | 60ppb |
| Florida | Flagler County | 56ppb |
| Florida | Franklin County | No air monitoring |
| Florida | Gadsden County | No air monitoring |
| Florida | Gilchrist County | No air monitoring |
| Florida | Glades County | No air monitoring |
| Florida | Gulf County | No air monitoring |
| Florida | Hamilton County | No air monitoring |
| Florida | Hardee County | No air monitoring |
| Florida | Hendry County | No air monitoring |
| Florida | Hernando County | No air monitoring |
| Florida | Highlands County | 58ppb |
| Florida | Hillsborough County | 65ppb |
| Florida | Holmes County | 55ppb |
| Florida | Indian River County | 59ppb |
| Florida | Jackson County | No air monitoring |
| Florida | Jefferson County | No air monitoring |
| Florida | Lafayette County | No air monitoring |
| Florida | Lake County | 60ppb |
| Florida | Lee County | No air monitoring |
| Florida | Leon County | 57ppb |
| Florida | Levy County | No air monitoring |
| Florida | Liberty County | 56ppb |
| Florida | Madison County | No air monitoring |
| Florida | Manatee County | 58ppb |
| Florida | Marion County | 62ppb |
| Florida | Martin County | 55ppb |
| Florida | Miami-Dade County | 60ppb |
| Florida | Monroe County | No air monitoring |
| Florida | Nassau County | No air monitoring |
| Florida | Okaloosa County | No air monitoring |
| Florida | Okeechobee County | No air monitoring |
| Florida | Orange County | 62ppb |
| Florida | Osceola County | 60ppb |
| Florida | Palm Beach County | 56ppb |
| Florida | Pasco County | 60ppb |
| Florida | Pinellas County | 61ppb |
| Florida | Polk County | 61ppb |
| Florida | Putnam County | No air monitoring |
| Florida | St. Johns County | No air monitoring |
| Florida | St. Lucie County | 57ppb |
| Florida | Santa Rosa County | 60ppb |
| Florida | Sarasota County | 61ppb |
| Florida | Seminole County | 60ppb |
| Florida | Sumter County | No air monitoring |
| Florida | Suwannee County | No air monitoring |
| Florida | Taylor County | No air monitoring |
| Florida | Union County | No air monitoring |
| Florida | Volusia County | 58ppb |
| Florida | Wakulla County | 55ppb |
| Florida | Walton County | No air monitoring |
| Florida | Washington County | No air monitoring |
| Georgia | Appling County | No air monitoring |
| Georgia | Atkinson County | No air monitoring |
| Georgia | Bacon County | No air monitoring |
| Georgia | Baker County | No air monitoring |
| Georgia | Baldwin County | No air monitoring |
| Georgia | Banks County | No air monitoring |
| Georgia | Barrow County | No air monitoring |
| Georgia | Bartow County | No air monitoring |
| Georgia | Ben Hill County | No air monitoring |
| Georgia | Berrien County | No air monitoring |
| Georgia | Bibb County | 58ppb |
| Georgia | Bleckley County | No air monitoring |
| Georgia | Brantley County | No air monitoring |
| Georgia | Brooks County | No air monitoring |
| Georgia | Bryan County | No air monitoring |
| Georgia | Bulloch County | No air monitoring |
| Georgia | Burke County | No air monitoring |
| Georgia | Butts County | No air monitoring |
| Georgia | Calhoun County | No air monitoring |
| Georgia | Camden County | No air monitoring |
| Georgia | Candler County | No air monitoring |
| Georgia | Carroll County | No air monitoring |
| Georgia | Catoosa County | No air monitoring |
| Georgia | Charlton County | No air monitoring |
| Georgia | Chatham County | 56ppb |
| Georgia | Chattahoochee County | No air monitoring |
| Georgia | Chattooga County | 56ppb |
| Georgia | Cherokee County | No air monitoring |
| Georgia | Clarke County | 59ppb |
| Georgia | Clay County | No air monitoring |
| Georgia | Clayton County | No air monitoring |
| Georgia | Clinch County | No air monitoring |
| Georgia | Cobb County | 61ppb |
| Georgia | Coffee County | No air monitoring |
| Georgia | Colquitt County | No air monitoring |
| Georgia | Columbia County | 55ppb |
| Georgia | Cook County | No air monitoring |
| Georgia | Coweta County | No air monitoring |
| Georgia | Crawford County | No air monitoring |
| Georgia | Crisp County | No air monitoring |
| Georgia | Dade County | No air monitoring |
| Georgia | Dawson County | 59ppb |
| Georgia | Decatur County | No air monitoring |
| Georgia | DeKalb County | 64ppb |
| Georgia | Dodge County | No air monitoring |
| Georgia | Dooly County | No air monitoring |
| Georgia | Dougherty County | No air monitoring |
| Georgia | Douglas County | 63ppb |
| Georgia | Early County | No air monitoring |
| Georgia | Echols County | No air monitoring |
| Georgia | Effingham County | No air monitoring |
| Georgia | Elbert County | No air monitoring |
| Georgia | Emanuel County | No air monitoring |
| Georgia | Evans County | No air monitoring |
| Georgia | Fannin County | No air monitoring |
| Georgia | Fayette County | No air monitoring |
| Georgia | Floyd County | No air monitoring |
| Georgia | Forsyth County | No air monitoring |
| Georgia | Franklin County | No air monitoring |
| Georgia | Fulton County | 65ppb |
| Georgia | Gilmer County | No air monitoring |
| Georgia | Glascock County | No air monitoring |
| Georgia | Glynn County | 54ppb |
| Georgia | Gordon County | No air monitoring |
| Georgia | Grady County | No air monitoring |
| Georgia | Greene County | No air monitoring |
| Georgia | Gwinnett County | 64ppb |
| Georgia | Habersham County | No air monitoring |
| Georgia | Hall County | No air monitoring |
| Georgia | Hancock County | No air monitoring |
| Georgia | Haralson County | No air monitoring |
| Georgia | Harris County | No air monitoring |
| Georgia | Hart County | No air monitoring |
| Georgia | Heard County | No air monitoring |
| Georgia | Henry County | 64ppb |
| Georgia | Houston County | No air monitoring |
| Georgia | Irwin County | No air monitoring |
| Georgia | Jackson County | No air monitoring |
| Georgia | Jasper County | No air monitoring |
| Georgia | Jeff Davis County | No air monitoring |
| Georgia | Jefferson County | No air monitoring |
| Georgia | Jenkins County | No air monitoring |
| Georgia | Johnson County | No air monitoring |
| Georgia | Jones County | No air monitoring |
| Georgia | Lamar County | No air monitoring |
| Georgia | Lanier County | No air monitoring |
| Georgia | Laurens County | No air monitoring |
| Georgia | Lee County | No air monitoring |
| Georgia | Liberty County | No air monitoring |
| Georgia | Lincoln County | No air monitoring |
| Georgia | Long County | No air monitoring |
| Georgia | Lowndes County | No air monitoring |
| Georgia | Lumpkin County | No air monitoring |
| Georgia | McDuffie County | No air monitoring |
| Georgia | McIntosh County | No air monitoring |
| Georgia | Macon County | No air monitoring |
| Georgia | Madison County | No air monitoring |
| Georgia | Marion County | No air monitoring |
| Georgia | Meriwether County | No air monitoring |
| Georgia | Miller County | No air monitoring |
| Georgia | Mitchell County | No air monitoring |
| Georgia | Monroe County | No air monitoring |
| Georgia | Montgomery County | No air monitoring |
| Georgia | Morgan County | No air monitoring |
| Georgia | Murray County | 62ppb |
| Georgia | Muscogee County | 57ppb |
| Georgia | Newton County | No air monitoring |
| Georgia | Oconee County | No air monitoring |
| Georgia | Oglethorpe County | No air monitoring |
| Georgia | Paulding County | No air monitoring |
| Georgia | Peach County | No air monitoring |
| Georgia | Pickens County | No air monitoring |
| Georgia | Pierce County | No air monitoring |
| Georgia | Pike County | 58ppb |
| Georgia | Polk County | No air monitoring |
| Georgia | Pulaski County | No air monitoring |
| Georgia | Putnam County | No air monitoring |
| Georgia | Quitman County | No air monitoring |
| Georgia | Rabun County | No air monitoring |
| Georgia | Randolph County | No air monitoring |
| Georgia | Richmond County | 60ppb |
| Georgia | Rockdale County | 62ppb |
| Georgia | Schley County | No air monitoring |
| Georgia | Screven County | No air monitoring |
| Georgia | Seminole County | No air monitoring |
| Georgia | Spalding County | No air monitoring |
| Georgia | Stephens County | No air monitoring |
| Georgia | Stewart County | No air monitoring |
| Georgia | Sumter County | 57ppb |
| Georgia | Talbot County | No air monitoring |
| Georgia | Taliaferro County | No air monitoring |
| Georgia | Tattnall County | No air monitoring |
| Georgia | Taylor County | No air monitoring |
| Georgia | Telfair County | No air monitoring |
| Georgia | Terrell County | No air monitoring |
| Georgia | Thomas County | No air monitoring |
| Georgia | Tift County | No air monitoring |
| Georgia | Toombs County | No air monitoring |
| Georgia | Towns County | No air monitoring |
| Georgia | Treutlen County | No air monitoring |
| Georgia | Troup County | No air monitoring |
| Georgia | Turner County | No air monitoring |
| Georgia | Twiggs County | No air monitoring |
| Georgia | Union County | No air monitoring |
| Georgia | Upson County | No air monitoring |
| Georgia | Walker County | No air monitoring |
| Georgia | Walton County | No air monitoring |
| Georgia | Ware County | No air monitoring |
| Georgia | Warren County | No air monitoring |
| Georgia | Washington County | No air monitoring |
| Georgia | Wayne County | No air monitoring |
| Georgia | Webster County | No air monitoring |
| Georgia | Wheeler County | No air monitoring |
| Georgia | White County | No air monitoring |
| Georgia | Whitfield County | No air monitoring |
| Georgia | Wilcox County | No air monitoring |
| Georgia | Wilkes County | No air monitoring |
| Georgia | Wilkinson County | No air monitoring |
| Georgia | Worth County | No air monitoring |
| Hawaii | Hawaii County | No air monitoring |
| Hawaii | Honolulu County | 44ppb |
| Hawaii | Kalawao County | No air monitoring |
| Hawaii | Kauai County | No air monitoring |
| Hawaii | Maui County | No air monitoring |
| Idaho | Ada County | 70ppb |
| Idaho | Adams County | No air monitoring |
| Idaho | Bannock County | 63ppb |
| Idaho | Bear Lake County | No air monitoring |
| Idaho | Benewah County | No air monitoring |
| Idaho | Bingham County | No air monitoring |
| Idaho | Blaine County | No air monitoring |
| Idaho | Boise County | No air monitoring |
| Idaho | Bonner County | No air monitoring |
| Idaho | Bonneville County | No air monitoring |
| Idaho | Boundary County | No air monitoring |
| Idaho | Butte County | 65ppb |
| Idaho | Camas County | No air monitoring |
| Idaho | Canyon County | No air monitoring |
| Idaho | Caribou County | No air monitoring |
| Idaho | Cassia County | No air monitoring |
| Idaho | Clark County | No air monitoring |
| Idaho | Clearwater County | No air monitoring |
| Idaho | Custer County | No air monitoring |
| Idaho | Elmore County | No air monitoring |
| Idaho | Franklin County | No air monitoring |
| Idaho | Fremont County | No air monitoring |
| Idaho | Gem County | No air monitoring |
| Idaho | Gooding County | No air monitoring |
| Idaho | Idaho County | 59ppb |
| Idaho | Jefferson County | No air monitoring |
| Idaho | Jerome County | No air monitoring |
| Idaho | Kootenai County | No air monitoring |
| Idaho | Latah County | No air monitoring |
| Idaho | Lemhi County | No air monitoring |
| Idaho | Lewis County | No air monitoring |
| Idaho | Lincoln County | No air monitoring |
| Idaho | Madison County | No air monitoring |
| Idaho | Minidoka County | No air monitoring |
| Idaho | Nez Perce County | No air monitoring |
| Idaho | Oneida County | No air monitoring |
| Idaho | Owyhee County | No air monitoring |
| Idaho | Payette County | No air monitoring |
| Idaho | Power County | No air monitoring |
| Idaho | Shoshone County | No air monitoring |
| Idaho | Teton County | No air monitoring |
| Idaho | Twin Falls County | No air monitoring |
| Idaho | Valley County | No air monitoring |
| Idaho | Washington County | No air monitoring |
| Illinois | Adams County | 61ppb |
| Illinois | Alexander County | No air monitoring |
| Illinois | Bond County | No air monitoring |
| Illinois | Boone County | No air monitoring |
| Illinois | Brown County | No air monitoring |
| Illinois | Bureau County | No air monitoring |
| Illinois | Calhoun County | No air monitoring |
| Illinois | Carroll County | No air monitoring |
| Illinois | Cass County | No air monitoring |
| Illinois | Champaign County | 65ppb |
| Illinois | Christian County | No air monitoring |
| Illinois | Clark County | 61ppb |
| Illinois | Clay County | No air monitoring |
| Illinois | Clinton County | No air monitoring |
| Illinois | Coles County | No air monitoring |
| Illinois | Cook County | 75ppb |
| Illinois | Crawford County | No air monitoring |
| Illinois | Cumberland County | No air monitoring |
| Illinois | DeKalb County | No air monitoring |
| Illinois | De Witt County | No air monitoring |
| Illinois | Douglas County | No air monitoring |
| Illinois | DuPage County | 70ppb |
| Illinois | Edgar County | No air monitoring |
| Illinois | Edwards County | No air monitoring |
| Illinois | Effingham County | No air monitoring |
| Illinois | Fayette County | No air monitoring |
| Illinois | Ford County | No air monitoring |
| Illinois | Franklin County | No air monitoring |
| Illinois | Fulton County | No air monitoring |
| Illinois | Gallatin County | No air monitoring |
| Illinois | Greene County | No air monitoring |
| Illinois | Grundy County | No air monitoring |
| Illinois | Hamilton County | 65ppb |
| Illinois | Hancock County | No air monitoring |
| Illinois | Hardin County | No air monitoring |
| Illinois | Henderson County | No air monitoring |
| Illinois | Henry County | No air monitoring |
| Illinois | Iroquois County | No air monitoring |
| Illinois | Jackson County | No air monitoring |
| Illinois | Jasper County | No air monitoring |
| Illinois | Jefferson County | No air monitoring |
| Illinois | Jersey County | 66ppb |
| Illinois | Jo Daviess County | 62ppb |
| Illinois | Johnson County | No air monitoring |
| Illinois | Kane County | 70ppb |
| Illinois | Kankakee County | No air monitoring |
| Illinois | Kendall County | No air monitoring |
| Illinois | Knox County | No air monitoring |
| Illinois | Lake County | 74ppb |
| Illinois | La Salle County | No air monitoring |
| Illinois | Lawrence County | No air monitoring |
| Illinois | Lee County | No air monitoring |
| Illinois | Livingston County | No air monitoring |
| Illinois | Logan County | No air monitoring |
| Illinois | McDonough County | No air monitoring |
| Illinois | McHenry County | 71ppb |
| Illinois | McLean County | 67ppb |
| Illinois | Macon County | 64ppb |
| Illinois | Macoupin County | 62ppb |
| Illinois | Madison County | 71ppb |
| Illinois | Marion County | No air monitoring |
| Illinois | Marshall County | No air monitoring |
| Illinois | Mason County | No air monitoring |
| Illinois | Massac County | No air monitoring |
| Illinois | Menard County | No air monitoring |
| Illinois | Mercer County | No air monitoring |
| Illinois | Monroe County | No air monitoring |
| Illinois | Montgomery County | No air monitoring |
| Illinois | Morgan County | No air monitoring |
| Illinois | Moultrie County | No air monitoring |
| Illinois | Ogle County | No air monitoring |
| Illinois | Peoria County | 65ppb |
| Illinois | Perry County | No air monitoring |
| Illinois | Piatt County | No air monitoring |
| Illinois | Pike County | No air monitoring |
| Illinois | Pope County | No air monitoring |
| Illinois | Pulaski County | No air monitoring |
| Illinois | Putnam County | No air monitoring |
| Illinois | Randolph County | 64ppb |
| Illinois | Richland County | No air monitoring |
| Illinois | Rock Island County | 63ppb |
| Illinois | St. Clair County | 66ppb |
| Illinois | Saline County | No air monitoring |
| Illinois | Sangamon County | 62ppb |
| Illinois | Schuyler County | No air monitoring |
| Illinois | Scott County | No air monitoring |
| Illinois | Shelby County | No air monitoring |
| Illinois | Stark County | No air monitoring |
| Illinois | Stephenson County | No air monitoring |
| Illinois | Tazewell County | No air monitoring |
| Illinois | Union County | No air monitoring |
| Illinois | Vermilion County | No air monitoring |
| Illinois | Wabash County | No air monitoring |
| Illinois | Warren County | No air monitoring |
| Illinois | Washington County | No air monitoring |
| Illinois | Wayne County | No air monitoring |
| Illinois | White County | No air monitoring |
| Illinois | Whiteside County | No air monitoring |
| Illinois | Will County | 65ppb |
| Illinois | Williamson County | No air monitoring |
| Illinois | Winnebago County | 66ppb |
| Illinois | Woodford County | No air monitoring |
| Indiana | Adams County | No air monitoring |
| Indiana | Allen County | 66ppb |
| Indiana | Bartholomew County | 64ppb |
| Indiana | Benton County | No air monitoring |
| Indiana | Blackford County | No air monitoring |
| Indiana | Boone County | 67ppb |
| Indiana | Brown County | 61ppb |
| Indiana | Carroll County | 64ppb |
| Indiana | Cass County | No air monitoring |
| Indiana | Clark County | 63ppb |
| Indiana | Clay County | No air monitoring |
| Indiana | Clinton County | No air monitoring |
| Indiana | Crawford County | No air monitoring |
| Indiana | Daviess County | No air monitoring |
| Indiana | Dearborn County | No air monitoring |
| Indiana | Decatur County | No air monitoring |
| Indiana | De Kalb County | No air monitoring |
| Indiana | Delaware County | 64ppb |
| Indiana | Dubois County | No air monitoring |
| Indiana | Elkhart County | 61ppb |
| Indiana | Fayette County | No air monitoring |
| Indiana | Floyd County | 64ppb |
| Indiana | Fountain County | No air monitoring |
| Indiana | Franklin County | No air monitoring |
| Indiana | Fulton County | No air monitoring |
| Indiana | Gibson County | No air monitoring |
| Indiana | Grant County | No air monitoring |
| Indiana | Greene County | 64ppb |
| Indiana | Hamilton County | 64ppb |
| Indiana | Hancock County | No air monitoring |
| Indiana | Harrison County | No air monitoring |
| Indiana | Hendricks County | 62ppb |
| Indiana | Henry County | No air monitoring |
| Indiana | Howard County | 66ppb |
| Indiana | Huntington County | No air monitoring |
| Indiana | Jackson County | No air monitoring |
| Indiana | Jasper County | No air monitoring |
| Indiana | Jay County | No air monitoring |
| Indiana | Jefferson County | No air monitoring |
| Indiana | Jennings County | No air monitoring |
| Indiana | Johnson County | No air monitoring |
| Indiana | Knox County | 66ppb |
| Indiana | Kosciusko County | No air monitoring |
| Indiana | Lagrange County | No air monitoring |
| Indiana | Lake County | 71ppb |
| Indiana | La Porte County | 73ppb |
| Indiana | Lawrence County | No air monitoring |
| Indiana | Madison County | No air monitoring |
| Indiana | Marion County | 68ppb |
| Indiana | Marshall County | No air monitoring |
| Indiana | Martin County | No air monitoring |
| Indiana | Miami County | No air monitoring |
| Indiana | Monroe County | No air monitoring |
| Indiana | Montgomery County | No air monitoring |
| Indiana | Morgan County | No air monitoring |
| Indiana | Newton County | No air monitoring |
| Indiana | Noble County | No air monitoring |
| Indiana | Ohio County | No air monitoring |
| Indiana | Orange County | No air monitoring |
| Indiana | Owen County | No air monitoring |
| Indiana | Parke County | No air monitoring |
| Indiana | Perry County | 64ppb |
| Indiana | Pike County | No air monitoring |
| Indiana | Porter County | 73ppb |
| Indiana | Posey County | 61ppb |
| Indiana | Pulaski County | No air monitoring |
| Indiana | Putnam County | No air monitoring |
| Indiana | Randolph County | No air monitoring |
| Indiana | Ripley County | No air monitoring |
| Indiana | Rush County | No air monitoring |
| Indiana | St. Joseph County | 67ppb |
| Indiana | Scott County | No air monitoring |
| Indiana | Shelby County | 63ppb |
| Indiana | Spencer County | No air monitoring |
| Indiana | Starke County | No air monitoring |
| Indiana | Steuben County | No air monitoring |
| Indiana | Sullivan County | No air monitoring |
| Indiana | Switzerland County | No air monitoring |
| Indiana | Tippecanoe County | No air monitoring |
| Indiana | Tipton County | No air monitoring |
| Indiana | Union County | No air monitoring |
| Indiana | Vanderburgh County | 66ppb |
| Indiana | Vermillion County | No air monitoring |
| Indiana | Vigo County | 65ppb |
| Indiana | Wabash County | 65ppb |
| Indiana | Warren County | No air monitoring |
| Indiana | Warrick County | 66ppb |
| Indiana | Washington County | No air monitoring |
| Indiana | Wayne County | No air monitoring |
| Indiana | Wells County | No air monitoring |
| Indiana | White County | No air monitoring |
| Indiana | Whitley County | No air monitoring |
| Iowa | Adair County | No air monitoring |
| Iowa | Adams County | No air monitoring |
| Iowa | Allamakee County | No air monitoring |
| Iowa | Appanoose County | No air monitoring |
| Iowa | Audubon County | No air monitoring |
| Iowa | Benton County | No air monitoring |
| Iowa | Black Hawk County | No air monitoring |
| Iowa | Boone County | No air monitoring |
| Iowa | Bremer County | 60ppb |
| Iowa | Buchanan County | No air monitoring |
| Iowa | Buena Vista County | No air monitoring |
| Iowa | Butler County | No air monitoring |
| Iowa | Calhoun County | No air monitoring |
| Iowa | Carroll County | No air monitoring |
| Iowa | Cass County | No air monitoring |
| Iowa | Cedar County | No air monitoring |
| Iowa | Cerro Gordo County | No air monitoring |
| Iowa | Cherokee County | No air monitoring |
| Iowa | Chickasaw County | No air monitoring |
| Iowa | Clarke County | No air monitoring |
| Iowa | Clay County | No air monitoring |
| Iowa | Clayton County | No air monitoring |
| Iowa | Clinton County | 63ppb |
| Iowa | Crawford County | No air monitoring |
| Iowa | Dallas County | No air monitoring |
| Iowa | Davis County | No air monitoring |
| Iowa | Decatur County | No air monitoring |
| Iowa | Delaware County | No air monitoring |
| Iowa | Des Moines County | No air monitoring |
| Iowa | Dickinson County | No air monitoring |
| Iowa | Dubuque County | No air monitoring |
| Iowa | Emmet County | No air monitoring |
| Iowa | Fayette County | No air monitoring |
| Iowa | Floyd County | No air monitoring |
| Iowa | Franklin County | No air monitoring |
| Iowa | Fremont County | No air monitoring |
| Iowa | Greene County | No air monitoring |
| Iowa | Grundy County | No air monitoring |
| Iowa | Guthrie County | No air monitoring |
| Iowa | Hamilton County | No air monitoring |
| Iowa | Hancock County | No air monitoring |
| Iowa | Hardin County | No air monitoring |
| Iowa | Harrison County | 61ppb |
| Iowa | Henry County | No air monitoring |
| Iowa | Howard County | No air monitoring |
| Iowa | Humboldt County | No air monitoring |
| Iowa | Ida County | No air monitoring |
| Iowa | Iowa County | No air monitoring |
| Iowa | Jackson County | No air monitoring |
| Iowa | Jasper County | No air monitoring |
| Iowa | Jefferson County | No air monitoring |
| Iowa | Johnson County | No air monitoring |
| Iowa | Jones County | No air monitoring |
| Iowa | Keokuk County | No air monitoring |
| Iowa | Kossuth County | No air monitoring |
| Iowa | Lee County | No air monitoring |
| Iowa | Linn County | 61ppb |
| Iowa | Louisa County | No air monitoring |
| Iowa | Lucas County | No air monitoring |
| Iowa | Lyon County | No air monitoring |
| Iowa | Madison County | No air monitoring |
| Iowa | Mahaska County | No air monitoring |
| Iowa | Marion County | No air monitoring |
| Iowa | Marshall County | No air monitoring |
| Iowa | Mills County | No air monitoring |
| Iowa | Mitchell County | No air monitoring |
| Iowa | Monona County | No air monitoring |
| Iowa | Monroe County | No air monitoring |
| Iowa | Montgomery County | 57ppb |
| Iowa | Muscatine County | No air monitoring |
| Iowa | O'Brien County | No air monitoring |
| Iowa | Osceola County | No air monitoring |
| Iowa | Page County | No air monitoring |
| Iowa | Palo Alto County | 61ppb |
| Iowa | Plymouth County | No air monitoring |
| Iowa | Pocahontas County | No air monitoring |
| Iowa | Polk County | 58ppb |
| Iowa | Pottawattamie County | No air monitoring |
| Iowa | Poweshiek County | No air monitoring |
| Iowa | Ringgold County | No air monitoring |
| Iowa | Sac County | No air monitoring |
| Iowa | Scott County | 60ppb |
| Iowa | Shelby County | No air monitoring |
| Iowa | Sioux County | No air monitoring |
| Iowa | Story County | No air monitoring |
| Iowa | Tama County | No air monitoring |
| Iowa | Taylor County | No air monitoring |
| Iowa | Union County | No air monitoring |
| Iowa | Van Buren County | 56ppb |
| Iowa | Wapello County | No air monitoring |
| Iowa | Warren County | No air monitoring |
| Iowa | Washington County | No air monitoring |
| Iowa | Wayne County | No air monitoring |
| Iowa | Webster County | No air monitoring |
| Iowa | Winnebago County | No air monitoring |
| Iowa | Winneshiek County | No air monitoring |
| Iowa | Woodbury County | No air monitoring |
| Iowa | Worth County | No air monitoring |
| Iowa | Wright County | No air monitoring |
| Kansas | Allen County | No air monitoring |
| Kansas | Anderson County | No air monitoring |
| Kansas | Atchison County | No air monitoring |
| Kansas | Barber County | No air monitoring |
| Kansas | Barton County | No air monitoring |
| Kansas | Bourbon County | No air monitoring |
| Kansas | Brown County | No air monitoring |
| Kansas | Butler County | No air monitoring |
| Kansas | Chase County | No air monitoring |
| Kansas | Chautauqua County | No air monitoring |
| Kansas | Cherokee County | No air monitoring |
| Kansas | Cheyenne County | No air monitoring |
| Kansas | Clark County | No air monitoring |
| Kansas | Clay County | No air monitoring |
| Kansas | Cloud County | No air monitoring |
| Kansas | Coffey County | No air monitoring |
| Kansas | Comanche County | No air monitoring |
| Kansas | Cowley County | No air monitoring |
| Kansas | Crawford County | No air monitoring |
| Kansas | Decatur County | No air monitoring |
| Kansas | Dickinson County | No air monitoring |
| Kansas | Doniphan County | No air monitoring |
| Kansas | Douglas County | No air monitoring |
| Kansas | Edwards County | No air monitoring |
| Kansas | Elk County | No air monitoring |
| Kansas | Ellis County | No air monitoring |
| Kansas | Ellsworth County | No air monitoring |
| Kansas | Finney County | No air monitoring |
| Kansas | Ford County | No air monitoring |
| Kansas | Franklin County | No air monitoring |
| Kansas | Geary County | No air monitoring |
| Kansas | Gove County | No air monitoring |
| Kansas | Graham County | No air monitoring |
| Kansas | Grant County | No air monitoring |
| Kansas | Gray County | No air monitoring |
| Kansas | Greeley County | No air monitoring |
| Kansas | Greenwood County | No air monitoring |
| Kansas | Hamilton County | No air monitoring |
| Kansas | Harper County | No air monitoring |
| Kansas | Harvey County | No air monitoring |
| Kansas | Haskell County | No air monitoring |
| Kansas | Hodgeman County | No air monitoring |
| Kansas | Jackson County | No air monitoring |
| Kansas | Jefferson County | No air monitoring |
| Kansas | Jewell County | No air monitoring |
| Kansas | Johnson County | 60ppb |
| Kansas | Kearny County | No air monitoring |
| Kansas | Kingman County | No air monitoring |
| Kansas | Kiowa County | No air monitoring |
| Kansas | Labette County | No air monitoring |
| Kansas | Lane County | No air monitoring |
| Kansas | Leavenworth County | 61ppb |
| Kansas | Lincoln County | No air monitoring |
| Kansas | Linn County | No air monitoring |
| Kansas | Logan County | No air monitoring |
| Kansas | Lyon County | No air monitoring |
| Kansas | McPherson County | No air monitoring |
| Kansas | Marion County | No air monitoring |
| Kansas | Marshall County | No air monitoring |
| Kansas | Meade County | No air monitoring |
| Kansas | Miami County | No air monitoring |
| Kansas | Mitchell County | No air monitoring |
| Kansas | Montgomery County | No air monitoring |
| Kansas | Morris County | No air monitoring |
| Kansas | Morton County | No air monitoring |
| Kansas | Nemaha County | No air monitoring |
| Kansas | Neosho County | 60ppb |
| Kansas | Ness County | No air monitoring |
| Kansas | Norton County | No air monitoring |
| Kansas | Osage County | No air monitoring |
| Kansas | Osborne County | No air monitoring |
| Kansas | Ottawa County | No air monitoring |
| Kansas | Pawnee County | No air monitoring |
| Kansas | Phillips County | No air monitoring |
| Kansas | Pottawatomie County | No air monitoring |
| Kansas | Pratt County | No air monitoring |
| Kansas | Rawlins County | No air monitoring |
| Kansas | Reno County | No air monitoring |
| Kansas | Republic County | No air monitoring |
| Kansas | Rice County | No air monitoring |
| Kansas | Riley County | No air monitoring |
| Kansas | Rooks County | No air monitoring |
| Kansas | Rush County | No air monitoring |
| Kansas | Russell County | No air monitoring |
| Kansas | Saline County | No air monitoring |
| Kansas | Scott County | No air monitoring |
| Kansas | Sedgwick County | 64ppb |
| Kansas | Seward County | No air monitoring |
| Kansas | Shawnee County | 59ppb |
| Kansas | Sheridan County | No air monitoring |
| Kansas | Sherman County | No air monitoring |
| Kansas | Smith County | No air monitoring |
| Kansas | Stafford County | No air monitoring |
| Kansas | Stanton County | No air monitoring |
| Kansas | Stevens County | No air monitoring |
| Kansas | Sumner County | 63ppb |
| Kansas | Thomas County | No air monitoring |
| Kansas | Trego County | 62ppb |
| Kansas | Wabaunsee County | No air monitoring |
| Kansas | Wallace County | No air monitoring |
| Kansas | Washington County | No air monitoring |
| Kansas | Wichita County | No air monitoring |
| Kansas | Wilson County | No air monitoring |
| Kansas | Woodson County | No air monitoring |
| Kansas | Wyandotte County | 65ppb |
| Kentucky | Adair County | No air monitoring |
| Kentucky | Allen County | No air monitoring |
| Kentucky | Anderson County | No air monitoring |
| Kentucky | Ballard County | No air monitoring |
| Kentucky | Barren County | No air monitoring |
| Kentucky | Bath County | No air monitoring |
| Kentucky | Bell County | 56ppb |
| Kentucky | Boone County | No air monitoring |
| Kentucky | Bourbon County | No air monitoring |
| Kentucky | Boyd County | 59ppb |
| Kentucky | Boyle County | No air monitoring |
| Kentucky | Bracken County | No air monitoring |
| Kentucky | Breathitt County | No air monitoring |
| Kentucky | Breckinridge County | No air monitoring |
| Kentucky | Bullitt County | 64ppb |
| Kentucky | Butler County | No air monitoring |
| Kentucky | Caldwell County | No air monitoring |
| Kentucky | Calloway County | No air monitoring |
| Kentucky | Campbell County | 63ppb |
| Kentucky | Carlisle County | No air monitoring |
| Kentucky | Carroll County | No air monitoring |
| Kentucky | Carter County | 56ppb |
| Kentucky | Casey County | No air monitoring |
| Kentucky | Christian County | 59ppb |
| Kentucky | Clark County | No air monitoring |
| Kentucky | Clay County | No air monitoring |
| Kentucky | Clinton County | No air monitoring |
| Kentucky | Crittenden County | No air monitoring |
| Kentucky | Cumberland County | No air monitoring |
| Kentucky | Daviess County | 64ppb |
| Kentucky | Edmonson County | 59ppb |
| Kentucky | Elliott County | No air monitoring |
| Kentucky | Estill County | No air monitoring |
| Kentucky | Fayette County | 63ppb |
| Kentucky | Fleming County | No air monitoring |
| Kentucky | Floyd County | No air monitoring |
| Kentucky | Franklin County | No air monitoring |
| Kentucky | Fulton County | No air monitoring |
| Kentucky | Gallatin County | No air monitoring |
| Kentucky | Garrard County | No air monitoring |
| Kentucky | Grant County | No air monitoring |
| Kentucky | Graves County | No air monitoring |
| Kentucky | Grayson County | No air monitoring |
| Kentucky | Green County | No air monitoring |
| Kentucky | Greenup County | 55ppb |
| Kentucky | Hancock County | 65ppb |
| Kentucky | Hardin County | 61ppb |
| Kentucky | Harlan County | No air monitoring |
| Kentucky | Harrison County | No air monitoring |
| Kentucky | Hart County | No air monitoring |
| Kentucky | Henderson County | No air monitoring |
| Kentucky | Henry County | No air monitoring |
| Kentucky | Hickman County | No air monitoring |
| Kentucky | Hopkins County | No air monitoring |
| Kentucky | Jackson County | No air monitoring |
| Kentucky | Jefferson County | 70ppb |
| Kentucky | Jessamine County | 62ppb |
| Kentucky | Johnson County | No air monitoring |
| Kentucky | Kenton County | No air monitoring |
| Kentucky | Knott County | No air monitoring |
| Kentucky | Knox County | No air monitoring |
| Kentucky | Larue County | No air monitoring |
| Kentucky | Laurel County | No air monitoring |
| Kentucky | Lawrence County | No air monitoring |
| Kentucky | Lee County | No air monitoring |
| Kentucky | Leslie County | No air monitoring |
| Kentucky | Letcher County | No air monitoring |
| Kentucky | Lewis County | No air monitoring |
| Kentucky | Lincoln County | No air monitoring |
| Kentucky | Livingston County | 64ppb |
| Kentucky | Logan County | No air monitoring |
| Kentucky | Lyon County | No air monitoring |
| Kentucky | McCracken County | 65ppb |
| Kentucky | McCreary County | No air monitoring |
| Kentucky | McLean County | No air monitoring |
| Kentucky | Madison County | No air monitoring |
| Kentucky | Magoffin County | No air monitoring |
| Kentucky | Marion County | No air monitoring |
| Kentucky | Marshall County | No air monitoring |
| Kentucky | Martin County | No air monitoring |
| Kentucky | Mason County | No air monitoring |
| Kentucky | Meade County | No air monitoring |
| Kentucky | Menifee County | No air monitoring |
| Kentucky | Mercer County | No air monitoring |
| Kentucky | Metcalfe County | No air monitoring |
| Kentucky | Monroe County | No air monitoring |
| Kentucky | Montgomery County | No air monitoring |
| Kentucky | Morgan County | 57ppb |
| Kentucky | Muhlenberg County | No air monitoring |
| Kentucky | Nelson County | No air monitoring |
| Kentucky | Nicholas County | No air monitoring |
| Kentucky | Ohio County | No air monitoring |
| Kentucky | Oldham County | 63ppb |
| Kentucky | Owen County | No air monitoring |
| Kentucky | Owsley County | No air monitoring |
| Kentucky | Pendleton County | No air monitoring |
| Kentucky | Perry County | 56ppb |
| Kentucky | Pike County | 55ppb |
| Kentucky | Powell County | No air monitoring |
| Kentucky | Pulaski County | 58ppb |
| Kentucky | Robertson County | No air monitoring |
| Kentucky | Rockcastle County | No air monitoring |
| Kentucky | Rowan County | No air monitoring |
| Kentucky | Russell County | No air monitoring |
| Kentucky | Scott County | No air monitoring |
| Kentucky | Shelby County | No air monitoring |
| Kentucky | Simpson County | 60ppb |
| Kentucky | Spencer County | No air monitoring |
| Kentucky | Taylor County | No air monitoring |
| Kentucky | Todd County | No air monitoring |
| Kentucky | Trigg County | No air monitoring |
| Kentucky | Trimble County | No air monitoring |
| Kentucky | Union County | No air monitoring |
| Kentucky | Warren County | 60ppb |
| Kentucky | Washington County | 60ppb |
| Kentucky | Wayne County | No air monitoring |
| Kentucky | Webster County | No air monitoring |
| Kentucky | Whitley County | No air monitoring |
| Kentucky | Wolfe County | No air monitoring |
| Kentucky | Woodford County | No air monitoring |
| Louisiana | Acadia Parish | No air monitoring |
| Louisiana | Allen Parish | No air monitoring |
| Louisiana | Ascension Parish | 64ppb |
| Louisiana | Assumption Parish | No air monitoring |
| Louisiana | Avoyelles Parish | No air monitoring |
| Louisiana | Beauregard Parish | No air monitoring |
| Louisiana | Bienville Parish | No air monitoring |
| Louisiana | Bossier Parish | 58ppb |
| Louisiana | Caddo Parish | 60ppb |
| Louisiana | Calcasieu Parish | 63ppb |
| Louisiana | Caldwell Parish | No air monitoring |
| Louisiana | Cameron Parish | No air monitoring |
| Louisiana | Catahoula Parish | No air monitoring |
| Louisiana | Claiborne Parish | No air monitoring |
| Louisiana | Concordia Parish | No air monitoring |
| Louisiana | De Soto Parish | No air monitoring |
| Louisiana | East Baton Rouge Parish | 65ppb |
| Louisiana | East Carroll Parish | No air monitoring |
| Louisiana | East Feliciana Parish | No air monitoring |
| Louisiana | Evangeline Parish | No air monitoring |
| Louisiana | Franklin Parish | No air monitoring |
| Louisiana | Grant Parish | No air monitoring |
| Louisiana | Iberia Parish | No air monitoring |
| Louisiana | Iberville Parish | 69ppb |
| Louisiana | Jackson Parish | No air monitoring |
| Louisiana | Jefferson Parish | 62ppb |
| Louisiana | Jefferson Davis Parish | No air monitoring |
| Louisiana | Lafayette Parish | 61ppb |
| Louisiana | Lafourche Parish | 59ppb |
| Louisiana | La Salle Parish | No air monitoring |
| Louisiana | Lincoln Parish | No air monitoring |
| Louisiana | Livingston Parish | 62ppb |
| Louisiana | Madison Parish | No air monitoring |
| Louisiana | Morehouse Parish | No air monitoring |
| Louisiana | Natchitoches Parish | No air monitoring |
| Louisiana | Orleans Parish | No air monitoring |
| Louisiana | Ouachita Parish | 58ppb |
| Louisiana | Plaquemines Parish | No air monitoring |
| Louisiana | Pointe Coupee Parish | 64ppb |
| Louisiana | Rapides Parish | No air monitoring |
| Louisiana | Red River Parish | No air monitoring |
| Louisiana | Richland Parish | No air monitoring |
| Louisiana | Sabine Parish | No air monitoring |
| Louisiana | St. Bernard Parish | 58ppb |
| Louisiana | St. Charles Parish | No air monitoring |
| Louisiana | St. Helena Parish | No air monitoring |
| Louisiana | St. James Parish | 59ppb |
| Louisiana | St. John the Baptist Parish | 60ppb |
| Louisiana | St. Landry Parish | No air monitoring |
| Louisiana | St. Martin Parish | 62ppb |
| Louisiana | St. Mary Parish | No air monitoring |
| Louisiana | St. Tammany Parish | 60ppb |
| Louisiana | Tangipahoa Parish | No air monitoring |
| Louisiana | Tensas Parish | No air monitoring |
| Louisiana | Terrebonne Parish | No air monitoring |
| Louisiana | Union Parish | No air monitoring |
| Louisiana | Vermilion Parish | No air monitoring |
| Louisiana | Vernon Parish | No air monitoring |
| Louisiana | Washington Parish | No air monitoring |
| Louisiana | Webster Parish | No air monitoring |
| Louisiana | West Baton Rouge Parish | 66ppb |
| Louisiana | West Carroll Parish | No air monitoring |
| Louisiana | West Feliciana Parish | No air monitoring |
| Louisiana | Winn Parish | No air monitoring |
| Maine | Androscoggin County | 56ppb |
| Maine | Aroostook County | 50ppb |
| Maine | Cumberland County | 62ppb |
| Maine | Franklin County | No air monitoring |
| Maine | Hancock County | 67ppb |
| Maine | Kennebec County | 54ppb |
| Maine | Knox County | 59ppb |
| Maine | Lincoln County | No air monitoring |
| Maine | Oxford County | 54ppb |
| Maine | Penobscot County | 59ppb |
| Maine | Piscataquis County | No air monitoring |
| Maine | Sagadahoc County | No air monitoring |
| Maine | Somerset County | No air monitoring |
| Maine | Waldo County | No air monitoring |
| Maine | Washington County | 55ppb |
| Maine | York County | 64ppb |
| Maryland | Allegany County | No air monitoring |
| Maryland | Anne Arundel County | 66ppb |
| Maryland | Baltimore County | 68ppb |
| Maryland | Calvert County | 58ppb |
| Maryland | Caroline County | No air monitoring |
| Maryland | Carroll County | 64ppb |
| Maryland | Cecil County | 65ppb |
| Maryland | Charles County | 59ppb |
| Maryland | Dorchester County | 63ppb |
| Maryland | Frederick County | 63ppb |
| Maryland | Garrett County | 58ppb |
| Maryland | Harford County | 68ppb |
| Maryland | Howard County | No air monitoring |
| Maryland | Kent County | 64ppb |
| Maryland | Montgomery County | 63ppb |
| Maryland | Prince George's County | 67ppb |
| Maryland | Queen Anne's County | No air monitoring |
| Maryland | St. Mary's County | No air monitoring |
| Maryland | Somerset County | No air monitoring |
| Maryland | Talbot County | No air monitoring |
| Maryland | Washington County | 61ppb |
| Maryland | Wicomico County | No air monitoring |
| Maryland | Worcester County | No air monitoring |
| Maryland | Baltimore city | No air monitoring |
| Massachusetts | Barnstable County | 64ppb |
| Massachusetts | Berkshire County | 60ppb |
| Massachusetts | Bristol County | 65ppb |
| Massachusetts | Dukes County | 62ppb |
| Massachusetts | Essex County | 64ppb |
| Massachusetts | Franklin County | 56ppb |
| Massachusetts | Hampden County | 64ppb |
| Massachusetts | Hampshire County | 62ppb |
| Massachusetts | Middlesex County | 60ppb |
| Massachusetts | Nantucket County | No air monitoring |
| Massachusetts | Norfolk County | 58ppb |
| Massachusetts | Plymouth County | 61ppb |
| Massachusetts | Suffolk County | 61ppb |
| Massachusetts | Worcester County | 62ppb |
| Michigan | Alcona County | No air monitoring |
| Michigan | Alger County | No air monitoring |
| Michigan | Allegan County | 75ppb |
| Michigan | Alpena County | No air monitoring |
| Michigan | Antrim County | No air monitoring |
| Michigan | Arenac County | No air monitoring |
| Michigan | Baraga County | No air monitoring |
| Michigan | Barry County | No air monitoring |
| Michigan | Bay County | No air monitoring |
| Michigan | Benzie County | 68ppb |
| Michigan | Berrien County | 73ppb |
| Michigan | Branch County | No air monitoring |
| Michigan | Calhoun County | No air monitoring |
| Michigan | Cass County | 70ppb |
| Michigan | Charlevoix County | No air monitoring |
| Michigan | Cheboygan County | No air monitoring |
| Michigan | Chippewa County | No air monitoring |
| Michigan | Clare County | No air monitoring |
| Michigan | Clinton County | 64ppb |
| Michigan | Crawford County | No air monitoring |
| Michigan | Delta County | No air monitoring |
| Michigan | Dickinson County | No air monitoring |
| Michigan | Eaton County | No air monitoring |
| Michigan | Emmet County | No air monitoring |
| Michigan | Genesee County | 67ppb |
| Michigan | Gladwin County | No air monitoring |
| Michigan | Gogebic County | No air monitoring |
| Michigan | Grand Traverse County | No air monitoring |
| Michigan | Gratiot County | No air monitoring |
| Michigan | Hillsdale County | No air monitoring |
| Michigan | Houghton County | No air monitoring |
| Michigan | Huron County | 70ppb |
| Michigan | Ingham County | 62ppb |
| Michigan | Ionia County | No air monitoring |
| Michigan | Iosco County | No air monitoring |
| Michigan | Iron County | No air monitoring |
| Michigan | Isabella County | No air monitoring |
| Michigan | Jackson County | No air monitoring |
| Michigan | Kalamazoo County | 68ppb |
| Michigan | Kalkaska County | No air monitoring |
| Michigan | Kent County | 71ppb |
| Michigan | Keweenaw County | No air monitoring |
| Michigan | Lake County | No air monitoring |
| Michigan | Lapeer County | No air monitoring |
| Michigan | Leelanau County | No air monitoring |
| Michigan | Lenawee County | 66ppb |
| Michigan | Livingston County | No air monitoring |
| Michigan | Luce County | No air monitoring |
| Michigan | Mackinac County | No air monitoring |
| Michigan | Macomb County | 69ppb |
| Michigan | Manistee County | No air monitoring |
| Michigan | Marquette County | No air monitoring |
| Michigan | Mason County | 67ppb |
| Michigan | Mecosta County | No air monitoring |
| Michigan | Menominee County | No air monitoring |
| Michigan | Midland County | No air monitoring |
| Michigan | Missaukee County | 65ppb |
| Michigan | Monroe County | No air monitoring |
| Michigan | Montcalm County | No air monitoring |
| Michigan | Montmorency County | No air monitoring |
| Michigan | Muskegon County | 79ppb |
| Michigan | Newaygo County | No air monitoring |
| Michigan | Oakland County | 69ppb |
| Michigan | Oceana County | No air monitoring |
| Michigan | Ogemaw County | No air monitoring |
| Michigan | Ontonagon County | No air monitoring |
| Michigan | Osceola County | No air monitoring |
| Michigan | Oscoda County | No air monitoring |
| Michigan | Otsego County | No air monitoring |
| Michigan | Ottawa County | 71ppb |
| Michigan | Presque Isle County | No air monitoring |
| Michigan | Roscommon County | No air monitoring |
| Michigan | Saginaw County | No air monitoring |
| Michigan | St. Clair County | 69ppb |
| Michigan | St. Joseph County | No air monitoring |
| Michigan | Sanilac County | No air monitoring |
| Michigan | Schoolcraft County | 66ppb |
| Michigan | Shiawassee County | No air monitoring |
| Michigan | Tuscola County | 66ppb |
| Michigan | Van Buren County | No air monitoring |
| Michigan | Washtenaw County | 68ppb |
| Michigan | Wayne County | 70ppb |
| Michigan | Wexford County | 68ppb |
| Minnesota | Aitkin County | No air monitoring |
| Minnesota | Anoka County | 62ppb |
| Minnesota | Becker County | No air monitoring |
| Minnesota | Beltrami County | No air monitoring |
| Minnesota | Benton County | No air monitoring |
| Minnesota | Big Stone County | No air monitoring |
| Minnesota | Blue Earth County | No air monitoring |
| Minnesota | Brown County | No air monitoring |
| Minnesota | Carlton County | No air monitoring |
| Minnesota | Carver County | No air monitoring |
| Minnesota | Cass County | No air monitoring |
| Minnesota | Chippewa County | No air monitoring |
| Minnesota | Chisago County | No air monitoring |
| Minnesota | Clay County | No air monitoring |
| Minnesota | Clearwater County | No air monitoring |
| Minnesota | Cook County | No air monitoring |
| Minnesota | Cottonwood County | No air monitoring |
| Minnesota | Crow Wing County | 57ppb |
| Minnesota | Dakota County | No air monitoring |
| Minnesota | Dodge County | No air monitoring |
| Minnesota | Douglas County | No air monitoring |
| Minnesota | Faribault County | No air monitoring |
| Minnesota | Fillmore County | No air monitoring |
| Minnesota | Freeborn County | No air monitoring |
| Minnesota | Goodhue County | No air monitoring |
| Minnesota | Grant County | No air monitoring |
| Minnesota | Hennepin County | 53ppb |
| Minnesota | Houston County | No air monitoring |
| Minnesota | Hubbard County | No air monitoring |
| Minnesota | Isanti County | No air monitoring |
| Minnesota | Itasca County | No air monitoring |
| Minnesota | Jackson County | No air monitoring |
| Minnesota | Kanabec County | No air monitoring |
| Minnesota | Kandiyohi County | No air monitoring |
| Minnesota | Kittson County | No air monitoring |
| Minnesota | Koochiching County | No air monitoring |
| Minnesota | Lac qui Parle County | No air monitoring |
| Minnesota | Lake County | 55ppb |
| Minnesota | Lake of the Woods County | No air monitoring |
| Minnesota | Le Sueur County | No air monitoring |
| Minnesota | Lincoln County | No air monitoring |
| Minnesota | Lyon County | 62ppb |
| Minnesota | McLeod County | No air monitoring |
| Minnesota | Mahnomen County | No air monitoring |
| Minnesota | Marshall County | No air monitoring |
| Minnesota | Martin County | No air monitoring |
| Minnesota | Meeker County | No air monitoring |
| Minnesota | Mille Lacs County | No air monitoring |
| Minnesota | Morrison County | No air monitoring |
| Minnesota | Mower County | No air monitoring |
| Minnesota | Murray County | No air monitoring |
| Minnesota | Nicollet County | No air monitoring |
| Minnesota | Nobles County | No air monitoring |
| Minnesota | Norman County | No air monitoring |
| Minnesota | Olmsted County | 63ppb |
| Minnesota | Otter Tail County | No air monitoring |
| Minnesota | Pennington County | No air monitoring |
| Minnesota | Pine County | No air monitoring |
| Minnesota | Pipestone County | No air monitoring |
| Minnesota | Polk County | No air monitoring |
| Minnesota | Pope County | No air monitoring |
| Minnesota | Ramsey County | No air monitoring |
| Minnesota | Red Lake County | No air monitoring |
| Minnesota | Redwood County | No air monitoring |
| Minnesota | Renville County | No air monitoring |
| Minnesota | Rice County | No air monitoring |
| Minnesota | Rock County | No air monitoring |
| Minnesota | Roseau County | No air monitoring |
| Minnesota | St. Louis County | 55ppb |
| Minnesota | Scott County | No air monitoring |
| Minnesota | Sherburne County | No air monitoring |
| Minnesota | Sibley County | No air monitoring |
| Minnesota | Stearns County | No air monitoring |
| Minnesota | Steele County | No air monitoring |
| Minnesota | Stevens County | No air monitoring |
| Minnesota | Swift County | No air monitoring |
| Minnesota | Todd County | No air monitoring |
| Minnesota | Traverse County | No air monitoring |
| Minnesota | Wabasha County | No air monitoring |
| Minnesota | Wadena County | No air monitoring |
| Minnesota | Waseca County | No air monitoring |
| Minnesota | Washington County | 62ppb |
| Minnesota | Watonwan County | No air monitoring |
| Minnesota | Wilkin County | No air monitoring |
| Minnesota | Winona County | No air monitoring |
| Minnesota | Wright County | 63ppb |
| Minnesota | Yellow Medicine County | No air monitoring |
| Mississippi | Adams County | No air monitoring |
| Mississippi | Alcorn County | No air monitoring |
| Mississippi | Amite County | No air monitoring |
| Mississippi | Attala County | No air monitoring |
| Mississippi | Benton County | No air monitoring |
| Mississippi | Bolivar County | 61ppb |
| Mississippi | Calhoun County | No air monitoring |
| Mississippi | Carroll County | No air monitoring |
| Mississippi | Chickasaw County | No air monitoring |
| Mississippi | Choctaw County | No air monitoring |
| Mississippi | Claiborne County | No air monitoring |
| Mississippi | Clarke County | No air monitoring |
| Mississippi | Clay County | No air monitoring |
| Mississippi | Coahoma County | No air monitoring |
| Mississippi | Copiah County | No air monitoring |
| Mississippi | Covington County | No air monitoring |
| Mississippi | DeSoto County | 67ppb |
| Mississippi | Forrest County | No air monitoring |
| Mississippi | Franklin County | No air monitoring |
| Mississippi | George County | No air monitoring |
| Mississippi | Greene County | No air monitoring |
| Mississippi | Grenada County | No air monitoring |
| Mississippi | Hancock County | 58ppb |
| Mississippi | Harrison County | 60ppb |
| Mississippi | Hinds County | 56ppb |
| Mississippi | Holmes County | No air monitoring |
| Mississippi | Humphreys County | No air monitoring |
| Mississippi | Issaquena County | No air monitoring |
| Mississippi | Itawamba County | No air monitoring |
| Mississippi | Jackson County | 61ppb |
| Mississippi | Jasper County | No air monitoring |
| Mississippi | Jefferson County | No air monitoring |
| Mississippi | Jefferson Davis County | No air monitoring |
| Mississippi | Jones County | No air monitoring |
| Mississippi | Kemper County | No air monitoring |
| Mississippi | Lafayette County | No air monitoring |
| Mississippi | Lamar County | No air monitoring |
| Mississippi | Lauderdale County | 54ppb |
| Mississippi | Lawrence County | No air monitoring |
| Mississippi | Leake County | No air monitoring |
| Mississippi | Lee County | 59ppb |
| Mississippi | Leflore County | No air monitoring |
| Mississippi | Lincoln County | No air monitoring |
| Mississippi | Lowndes County | No air monitoring |
| Mississippi | Madison County | No air monitoring |
| Mississippi | Marion County | No air monitoring |
| Mississippi | Marshall County | No air monitoring |
| Mississippi | Monroe County | No air monitoring |
| Mississippi | Montgomery County | No air monitoring |
| Mississippi | Neshoba County | No air monitoring |
| Mississippi | Newton County | No air monitoring |
| Mississippi | Noxubee County | No air monitoring |
| Mississippi | Oktibbeha County | No air monitoring |
| Mississippi | Panola County | No air monitoring |
| Mississippi | Pearl River County | No air monitoring |
| Mississippi | Perry County | No air monitoring |
| Mississippi | Pike County | No air monitoring |
| Mississippi | Pontotoc County | No air monitoring |
| Mississippi | Prentiss County | No air monitoring |
| Mississippi | Quitman County | No air monitoring |
| Mississippi | Rankin County | No air monitoring |
| Mississippi | Scott County | No air monitoring |
| Mississippi | Sharkey County | No air monitoring |
| Mississippi | Simpson County | No air monitoring |
| Mississippi | Smith County | No air monitoring |
| Mississippi | Stone County | No air monitoring |
| Mississippi | Sunflower County | No air monitoring |
| Mississippi | Tallahatchie County | No air monitoring |
| Mississippi | Tate County | No air monitoring |
| Mississippi | Tippah County | No air monitoring |
| Mississippi | Tishomingo County | No air monitoring |
| Mississippi | Tunica County | No air monitoring |
| Mississippi | Union County | No air monitoring |
| Mississippi | Walthall County | No air monitoring |
| Mississippi | Warren County | No air monitoring |
| Mississippi | Washington County | No air monitoring |
| Mississippi | Wayne County | No air monitoring |
| Mississippi | Webster County | No air monitoring |
| Mississippi | Wilkinson County | No air monitoring |
| Mississippi | Winston County | No air monitoring |
| Mississippi | Yalobusha County | 57ppb |
| Mississippi | Yazoo County | No air monitoring |
| Missouri | Adair County | No air monitoring |
| Missouri | Andrew County | 61ppb |
| Missouri | Atchison County | No air monitoring |
| Missouri | Audrain County | No air monitoring |
| Missouri | Barry County | No air monitoring |
| Missouri | Barton County | No air monitoring |
| Missouri | Bates County | No air monitoring |
| Missouri | Benton County | No air monitoring |
| Missouri | Bollinger County | No air monitoring |
| Missouri | Boone County | 57ppb |
| Missouri | Buchanan County | No air monitoring |
| Missouri | Butler County | No air monitoring |
| Missouri | Caldwell County | No air monitoring |
| Missouri | Callaway County | 59ppb |
| Missouri | Camden County | No air monitoring |
| Missouri | Cape Girardeau County | No air monitoring |
| Missouri | Carroll County | No air monitoring |
| Missouri | Carter County | No air monitoring |
| Missouri | Cass County | 61ppb |
| Missouri | Cedar County | 60ppb |
| Missouri | Chariton County | No air monitoring |
| Missouri | Christian County | No air monitoring |
| Missouri | Clark County | No air monitoring |
| Missouri | Clay County | 68ppb |
| Missouri | Clinton County | 63ppb |
| Missouri | Cole County | No air monitoring |
| Missouri | Cooper County | No air monitoring |
| Missouri | Crawford County | No air monitoring |
| Missouri | Dade County | No air monitoring |
| Missouri | Dallas County | No air monitoring |
| Missouri | Daviess County | No air monitoring |
| Missouri | DeKalb County | No air monitoring |
| Missouri | Dent County | No air monitoring |
| Missouri | Douglas County | No air monitoring |
| Missouri | Dunklin County | No air monitoring |
| Missouri | Franklin County | No air monitoring |
| Missouri | Gasconade County | No air monitoring |
| Missouri | Gentry County | No air monitoring |
| Missouri | Greene County | 61ppb |
| Missouri | Grundy County | No air monitoring |
| Missouri | Harrison County | No air monitoring |
| Missouri | Henry County | No air monitoring |
| Missouri | Hickory County | No air monitoring |
| Missouri | Holt County | No air monitoring |
| Missouri | Howard County | No air monitoring |
| Missouri | Howell County | No air monitoring |
| Missouri | Iron County | No air monitoring |
| Missouri | Jackson County | No air monitoring |
| Missouri | Jasper County | 63ppb |
| Missouri | Jefferson County | 68ppb |
| Missouri | Johnson County | No air monitoring |
| Missouri | Knox County | No air monitoring |
| Missouri | Laclede County | No air monitoring |
| Missouri | Lafayette County | No air monitoring |
| Missouri | Lawrence County | No air monitoring |
| Missouri | Lewis County | No air monitoring |
| Missouri | Lincoln County | 64ppb |
| Missouri | Linn County | No air monitoring |
| Missouri | Livingston County | No air monitoring |
| Missouri | McDonald County | No air monitoring |
| Missouri | Macon County | No air monitoring |
| Missouri | Madison County | No air monitoring |
| Missouri | Maries County | No air monitoring |
| Missouri | Marion County | No air monitoring |
| Missouri | Mercer County | No air monitoring |
| Missouri | Miller County | No air monitoring |
| Missouri | Mississippi County | No air monitoring |
| Missouri | Moniteau County | No air monitoring |
| Missouri | Monroe County | 54ppb |
| Missouri | Montgomery County | No air monitoring |
| Missouri | Morgan County | No air monitoring |
| Missouri | New Madrid County | No air monitoring |
| Missouri | Newton County | No air monitoring |
| Missouri | Nodaway County | No air monitoring |
| Missouri | Oregon County | No air monitoring |
| Missouri | Osage County | No air monitoring |
| Missouri | Ozark County | No air monitoring |
| Missouri | Pemiscot County | No air monitoring |
| Missouri | Perry County | 64ppb |
| Missouri | Pettis County | No air monitoring |
| Missouri | Phelps County | No air monitoring |
| Missouri | Pike County | No air monitoring |
| Missouri | Platte County | No air monitoring |
| Missouri | Polk County | No air monitoring |
| Missouri | Pulaski County | No air monitoring |
| Missouri | Putnam County | No air monitoring |
| Missouri | Ralls County | No air monitoring |
| Missouri | Randolph County | No air monitoring |
| Missouri | Ray County | No air monitoring |
| Missouri | Reynolds County | No air monitoring |
| Missouri | Ripley County | No air monitoring |
| Missouri | St. Charles County | 69ppb |
| Missouri | St. Clair County | No air monitoring |
| Missouri | Ste. Genevieve County | 63ppb |
| Missouri | St. Francois County | No air monitoring |
| Missouri | St. Louis County | 68ppb |
| Missouri | Saline County | No air monitoring |
| Missouri | Schuyler County | No air monitoring |
| Missouri | Scotland County | No air monitoring |
| Missouri | Scott County | No air monitoring |
| Missouri | Shannon County | No air monitoring |
| Missouri | Shelby County | No air monitoring |
| Missouri | Stoddard County | No air monitoring |
| Missouri | Stone County | No air monitoring |
| Missouri | Sullivan County | No air monitoring |
| Missouri | Taney County | No air monitoring |
| Missouri | Texas County | No air monitoring |
| Missouri | Vernon County | No air monitoring |
| Missouri | Warren County | No air monitoring |
| Missouri | Washington County | No air monitoring |
| Missouri | Wayne County | No air monitoring |
| Missouri | Webster County | No air monitoring |
| Missouri | Worth County | No air monitoring |
| Missouri | Wright County | No air monitoring |
| Missouri | St. Louis city | 67ppb |
| Montana | Beaverhead County | No air monitoring |
| Montana | Big Horn County | No air monitoring |
| Montana | Blaine County | No air monitoring |
| Montana | Broadwater County | No air monitoring |
| Montana | Carbon County | No air monitoring |
| Montana | Carter County | No air monitoring |
| Montana | Cascade County | No air monitoring |
| Montana | Chouteau County | No air monitoring |
| Montana | Custer County | No air monitoring |
| Montana | Daniels County | No air monitoring |
| Montana | Dawson County | No air monitoring |
| Montana | Deer Lodge County | No air monitoring |
| Montana | Fallon County | No air monitoring |
| Montana | Fergus County | 62ppb |
| Montana | Flathead County | 53ppb |
| Montana | Gallatin County | No air monitoring |
| Montana | Garfield County | No air monitoring |
| Montana | Glacier County | No air monitoring |
| Montana | Golden Valley County | No air monitoring |
| Montana | Granite County | No air monitoring |
| Montana | Hill County | No air monitoring |
| Montana | Jefferson County | No air monitoring |
| Montana | Judith Basin County | No air monitoring |
| Montana | Lake County | No air monitoring |
| Montana | Lewis and Clark County | 61ppb |
| Montana | Liberty County | No air monitoring |
| Montana | Lincoln County | No air monitoring |
| Montana | McCone County | No air monitoring |
| Montana | Madison County | No air monitoring |
| Montana | Meagher County | No air monitoring |
| Montana | Mineral County | No air monitoring |
| Montana | Missoula County | 58ppb |
| Montana | Musselshell County | No air monitoring |
| Montana | Park County | No air monitoring |
| Montana | Petroleum County | No air monitoring |
| Montana | Phillips County | 55ppb |
| Montana | Pondera County | No air monitoring |
| Montana | Powder River County | No air monitoring |
| Montana | Powell County | No air monitoring |
| Montana | Prairie County | No air monitoring |
| Montana | Ravalli County | No air monitoring |
| Montana | Richland County | 59ppb |
| Montana | Roosevelt County | No air monitoring |
| Montana | Rosebud County | No air monitoring |
| Montana | Sanders County | No air monitoring |
| Montana | Sheridan County | No air monitoring |
| Montana | Silver Bow County | No air monitoring |
| Montana | Stillwater County | No air monitoring |
| Montana | Sweet Grass County | No air monitoring |
| Montana | Teton County | No air monitoring |
| Montana | Toole County | No air monitoring |
| Montana | Treasure County | No air monitoring |
| Montana | Valley County | No air monitoring |
| Montana | Wheatland County | No air monitoring |
| Montana | Wibaux County | No air monitoring |
| Montana | Yellowstone County | No air monitoring |
| Montana | Yellowstone National Park | No air monitoring |
| Nebraska | Adams County | No air monitoring |
| Nebraska | Antelope County | No air monitoring |
| Nebraska | Arthur County | No air monitoring |
| Nebraska | Banner County | No air monitoring |
| Nebraska | Blaine County | No air monitoring |
| Nebraska | Boone County | No air monitoring |
| Nebraska | Box Butte County | No air monitoring |
| Nebraska | Boyd County | No air monitoring |
| Nebraska | Brown County | No air monitoring |
| Nebraska | Buffalo County | No air monitoring |
| Nebraska | Burt County | No air monitoring |
| Nebraska | Butler County | No air monitoring |
| Nebraska | Cass County | No air monitoring |
| Nebraska | Cedar County | No air monitoring |
| Nebraska | Chase County | No air monitoring |
| Nebraska | Cherry County | No air monitoring |
| Nebraska | Cheyenne County | No air monitoring |
| Nebraska | Clay County | No air monitoring |
| Nebraska | Colfax County | No air monitoring |
| Nebraska | Cuming County | No air monitoring |
| Nebraska | Custer County | No air monitoring |
| Nebraska | Dakota County | No air monitoring |
| Nebraska | Dawes County | No air monitoring |
| Nebraska | Dawson County | No air monitoring |
| Nebraska | Deuel County | No air monitoring |
| Nebraska | Dixon County | No air monitoring |
| Nebraska | Dodge County | No air monitoring |
| Nebraska | Douglas County | 61ppb |
| Nebraska | Dundy County | No air monitoring |
| Nebraska | Fillmore County | No air monitoring |
| Nebraska | Franklin County | No air monitoring |
| Nebraska | Frontier County | No air monitoring |
| Nebraska | Furnas County | No air monitoring |
| Nebraska | Gage County | No air monitoring |
| Nebraska | Garden County | No air monitoring |
| Nebraska | Garfield County | No air monitoring |
| Nebraska | Gosper County | No air monitoring |
| Nebraska | Grant County | No air monitoring |
| Nebraska | Greeley County | No air monitoring |
| Nebraska | Hall County | No air monitoring |
| Nebraska | Hamilton County | No air monitoring |
| Nebraska | Harlan County | No air monitoring |
| Nebraska | Hayes County | No air monitoring |
| Nebraska | Hitchcock County | No air monitoring |
| Nebraska | Holt County | No air monitoring |
| Nebraska | Hooker County | No air monitoring |
| Nebraska | Howard County | No air monitoring |
| Nebraska | Jefferson County | No air monitoring |
| Nebraska | Johnson County | No air monitoring |
| Nebraska | Kearney County | No air monitoring |
| Nebraska | Keith County | No air monitoring |
| Nebraska | Keya Paha County | No air monitoring |
| Nebraska | Kimball County | No air monitoring |
| Nebraska | Knox County | 67ppb |
| Nebraska | Lancaster County | 56ppb |
| Nebraska | Lincoln County | No air monitoring |
| Nebraska | Logan County | No air monitoring |
| Nebraska | Loup County | No air monitoring |
| Nebraska | McPherson County | No air monitoring |
| Nebraska | Madison County | No air monitoring |
| Nebraska | Merrick County | No air monitoring |
| Nebraska | Morrill County | No air monitoring |
| Nebraska | Nance County | No air monitoring |
| Nebraska | Nemaha County | No air monitoring |
| Nebraska | Nuckolls County | No air monitoring |
| Nebraska | Otoe County | No air monitoring |
| Nebraska | Pawnee County | No air monitoring |
| Nebraska | Perkins County | No air monitoring |
| Nebraska | Phelps County | No air monitoring |
| Nebraska | Pierce County | No air monitoring |
| Nebraska | Platte County | No air monitoring |
| Nebraska | Polk County | No air monitoring |
| Nebraska | Red Willow County | No air monitoring |
| Nebraska | Richardson County | No air monitoring |
| Nebraska | Rock County | No air monitoring |
| Nebraska | Saline County | No air monitoring |
| Nebraska | Sarpy County | No air monitoring |
| Nebraska | Saunders County | No air monitoring |
| Nebraska | Scotts Bluff County | No air monitoring |
| Nebraska | Seward County | No air monitoring |
| Nebraska | Sheridan County | No air monitoring |
| Nebraska | Sherman County | No air monitoring |
| Nebraska | Sioux County | No air monitoring |
| Nebraska | Stanton County | No air monitoring |
| Nebraska | Thayer County | No air monitoring |
| Nebraska | Thomas County | No air monitoring |
| Nebraska | Thurston County | No air monitoring |
| Nebraska | Valley County | No air monitoring |
| Nebraska | Washington County | No air monitoring |
| Nebraska | Wayne County | No air monitoring |
| Nebraska | Webster County | No air monitoring |
| Nebraska | Wheeler County | No air monitoring |
| Nebraska | York County | No air monitoring |
| Nevada | Churchill County | 68ppb |
| Nevada | Clark County | 75ppb |
| Nevada | Douglas County | No air monitoring |
| Nevada | Elko County | No air monitoring |
| Nevada | Esmeralda County | No air monitoring |
| Nevada | Eureka County | No air monitoring |
| Nevada | Humboldt County | No air monitoring |
| Nevada | Lander County | No air monitoring |
| Nevada | Lincoln County | No air monitoring |
| Nevada | Lyon County | No air monitoring |
| Nevada | Mineral County | No air monitoring |
| Nevada | Nye County | No air monitoring |
| Nevada | Pershing County | No air monitoring |
| Nevada | Storey County | No air monitoring |
| Nevada | Washoe County | 73ppb |
| Nevada | White Pine County | 66ppb |
| Nevada | Carson City | 71ppb |
| New Hampshire | Belknap County | 55ppb |
| New Hampshire | Carroll County | No air monitoring |
| New Hampshire | Cheshire County | 56ppb |
| New Hampshire | Coos County | 55ppb |
| New Hampshire | Grafton County | 53ppb |
| New Hampshire | Hillsborough County | 60ppb |
| New Hampshire | Merrimack County | 57ppb |
| New Hampshire | Rockingham County | 65ppb |
| New Hampshire | Strafford County | No air monitoring |
| New Hampshire | Sullivan County | No air monitoring |
| New Jersey | Atlantic County | 59ppb |
| New Jersey | Bergen County | 68ppb |
| New Jersey | Burlington County | No air monitoring |
| New Jersey | Camden County | 64ppb |
| New Jersey | Cape May County | No air monitoring |
| New Jersey | Cumberland County | 63ppb |
| New Jersey | Essex County | No air monitoring |
| New Jersey | Gloucester County | 66ppb |
| New Jersey | Hudson County | 66ppb |
| New Jersey | Hunterdon County | 62ppb |
| New Jersey | Mercer County | 69ppb |
| New Jersey | Middlesex County | 68ppb |
| New Jersey | Monmouth County | 67ppb |
| New Jersey | Morris County | 62ppb |
| New Jersey | Ocean County | 66ppb |
| New Jersey | Passaic County | 60ppb |
| New Jersey | Salem County | No air monitoring |
| New Jersey | Somerset County | No air monitoring |
| New Jersey | Sussex County | No air monitoring |
| New Jersey | Union County | No air monitoring |
| New Jersey | Warren County | 58ppb |
| New Mexico | Bernalillo County | 73ppb |
| New Mexico | Catron County | No air monitoring |
| New Mexico | Chaves County | No air monitoring |
| New Mexico | Cibola County | No air monitoring |
| New Mexico | Colfax County | No air monitoring |
| New Mexico | Curry County | No air monitoring |
| New Mexico | DeBaca County | No air monitoring |
| New Mexico | Dona Ana County | 81ppb |
| New Mexico | Eddy County | 77ppb |
| New Mexico | Grant County | No air monitoring |
| New Mexico | Guadalupe County | No air monitoring |
| New Mexico | Harding County | No air monitoring |
| New Mexico | Hidalgo County | No air monitoring |
| New Mexico | Lea County | 66ppb |
| New Mexico | Lincoln County | No air monitoring |
| New Mexico | Los Alamos County | No air monitoring |
| New Mexico | Luna County | No air monitoring |
| New Mexico | McKinley County | No air monitoring |
| New Mexico | Mora County | No air monitoring |
| New Mexico | Otero County | No air monitoring |
| New Mexico | Quay County | No air monitoring |
| New Mexico | Rio Arriba County | 64ppb |
| New Mexico | Roosevelt County | No air monitoring |
| New Mexico | Sandoval County | 70ppb |
| New Mexico | San Juan County | 70ppb |
| New Mexico | San Miguel County | No air monitoring |
| New Mexico | Santa Fe County | 67ppb |
| New Mexico | Sierra County | No air monitoring |
| New Mexico | Socorro County | No air monitoring |
| New Mexico | Taos County | No air monitoring |
| New Mexico | Torrance County | No air monitoring |
| New Mexico | Union County | No air monitoring |
| New Mexico | Valencia County | 66ppb |
| New York | Albany County | 57ppb |
| New York | Allegany County | No air monitoring |
| New York | Bronx County | 69ppb |
| New York | Broome County | No air monitoring |
| New York | Cattaraugus County | No air monitoring |
| New York | Cayuga County | No air monitoring |
| New York | Chautauqua County | 67ppb |
| New York | Chemung County | No air monitoring |
| New York | Chenango County | No air monitoring |
| New York | Clinton County | No air monitoring |
| New York | Columbia County | No air monitoring |
| New York | Cortland County | No air monitoring |
| New York | Delaware County | No air monitoring |
| New York | Dutchess County | 61ppb |
| New York | Erie County | No air monitoring |
| New York | Essex County | 62ppb |
| New York | Franklin County | No air monitoring |
| New York | Fulton County | No air monitoring |
| New York | Genesee County | No air monitoring |
| New York | Greene County | No air monitoring |
| New York | Hamilton County | 56ppb |
| New York | Herkimer County | No air monitoring |
| New York | Jefferson County | 62ppb |
| New York | Kings County | No air monitoring |
| New York | Lewis County | No air monitoring |
| New York | Livingston County | No air monitoring |
| New York | Madison County | No air monitoring |
| New York | Monroe County | 65ppb |
| New York | Montgomery County | No air monitoring |
| New York | Nassau County | No air monitoring |
| New York | New York County | 70ppb |
| New York | Niagara County | 66ppb |
| New York | Oneida County | No air monitoring |
| New York | Onondaga County | 60ppb |
| New York | Ontario County | No air monitoring |
| New York | Orange County | No air monitoring |
| New York | Orleans County | No air monitoring |
| New York | Oswego County | 59ppb |
| New York | Otsego County | No air monitoring |
| New York | Putnam County | 61ppb |
| New York | Queens County | 70ppb |
| New York | Rensselaer County | No air monitoring |
| New York | Richmond County | 66ppb |
| New York | Rockland County | 62ppb |
| New York | St. Lawrence County | No air monitoring |
| New York | Saratoga County | 58ppb |
| New York | Schenectady County | No air monitoring |
| New York | Schoharie County | No air monitoring |
| New York | Schuyler County | No air monitoring |
| New York | Seneca County | No air monitoring |
| New York | Steuben County | 56ppb |
| New York | Suffolk County | 74ppb |
| New York | Sullivan County | No air monitoring |
| New York | Tioga County | No air monitoring |
| New York | Tompkins County | 59ppb |
| New York | Ulster County | No air monitoring |
| New York | Warren County | No air monitoring |
| New York | Washington County | No air monitoring |
| New York | Wayne County | 61ppb |
| New York | Westchester County | 68ppb |
| New York | Wyoming County | No air monitoring |
| New York | Yates County | No air monitoring |
| North Carolina | Alamance County | No air monitoring |
| North Carolina | Alexander County | 58ppb |
| North Carolina | Alleghany County | No air monitoring |
| North Carolina | Anson County | No air monitoring |
| North Carolina | Ashe County | No air monitoring |
| North Carolina | Avery County | 57ppb |
| North Carolina | Beaufort County | No air monitoring |
| North Carolina | Bertie County | No air monitoring |
| North Carolina | Bladen County | No air monitoring |
| North Carolina | Brunswick County | No air monitoring |
| North Carolina | Buncombe County | 58ppb |
| North Carolina | Burke County | No air monitoring |
| North Carolina | Cabarrus County | No air monitoring |
| North Carolina | Caldwell County | 57ppb |
| North Carolina | Camden County | No air monitoring |
| North Carolina | Carteret County | 58ppb |
| North Carolina | Caswell County | 57ppb |
| North Carolina | Catawba County | No air monitoring |
| North Carolina | Chatham County | No air monitoring |
| North Carolina | Cherokee County | No air monitoring |
| North Carolina | Chowan County | No air monitoring |
| North Carolina | Clay County | No air monitoring |
| North Carolina | Cleveland County | No air monitoring |
| North Carolina | Columbus County | No air monitoring |
| North Carolina | Craven County | No air monitoring |
| North Carolina | Cumberland County | 63ppb |
| North Carolina | Currituck County | No air monitoring |
| North Carolina | Dare County | No air monitoring |
| North Carolina | Davidson County | No air monitoring |
| North Carolina | Davie County | No air monitoring |
| North Carolina | Duplin County | No air monitoring |
| North Carolina | Durham County | 58ppb |
| North Carolina | Edgecombe County | 59ppb |
| North Carolina | Forsyth County | 63ppb |
| North Carolina | Franklin County | No air monitoring |
| North Carolina | Gaston County | No air monitoring |
| North Carolina | Gates County | No air monitoring |
| North Carolina | Graham County | 62ppb |
| North Carolina | Granville County | 57ppb |
| North Carolina | Greene County | No air monitoring |
| North Carolina | Guilford County | 62ppb |
| North Carolina | Halifax County | No air monitoring |
| North Carolina | Harnett County | No air monitoring |
| North Carolina | Haywood County | 62ppb |
| North Carolina | Henderson County | No air monitoring |
| North Carolina | Hertford County | No air monitoring |
| North Carolina | Hoke County | No air monitoring |
| North Carolina | Hyde County | No air monitoring |
| North Carolina | Iredell County | No air monitoring |
| North Carolina | Jackson County | No air monitoring |
| North Carolina | Johnston County | 61ppb |
| North Carolina | Jones County | No air monitoring |
| North Carolina | Lee County | No air monitoring |
| North Carolina | Lenoir County | 61ppb |
| North Carolina | Lincoln County | 61ppb |
| North Carolina | McDowell County | No air monitoring |
| North Carolina | Macon County | 55ppb |
| North Carolina | Madison County | No air monitoring |
| North Carolina | Martin County | 54ppb |
| North Carolina | Mecklenburg County | 64ppb |
| North Carolina | Mitchell County | No air monitoring |
| North Carolina | Montgomery County | 58ppb |
| North Carolina | Moore County | No air monitoring |
| North Carolina | Nash County | No air monitoring |
| North Carolina | New Hanover County | 58ppb |
| North Carolina | Northampton County | No air monitoring |
| North Carolina | Onslow County | No air monitoring |
| North Carolina | Orange County | No air monitoring |
| North Carolina | Pamlico County | No air monitoring |
| North Carolina | Pasquotank County | No air monitoring |
| North Carolina | Pender County | No air monitoring |
| North Carolina | Perquimans County | No air monitoring |
| North Carolina | Person County | 57ppb |
| North Carolina | Pitt County | 59ppb |
| North Carolina | Polk County | No air monitoring |
| North Carolina | Randolph County | No air monitoring |
| North Carolina | Richmond County | No air monitoring |
| North Carolina | Robeson County | No air monitoring |
| North Carolina | Rockingham County | 60ppb |
| North Carolina | Rowan County | 61ppb |
| North Carolina | Rutherford County | No air monitoring |
| North Carolina | Sampson County | No air monitoring |
| North Carolina | Scotland County | No air monitoring |
| North Carolina | Stanly County | No air monitoring |
| North Carolina | Stokes County | No air monitoring |
| North Carolina | Surry County | No air monitoring |
| North Carolina | Swain County | 58ppb |
| North Carolina | Transylvania County | No air monitoring |
| North Carolina | Tyrrell County | No air monitoring |
| North Carolina | Union County | 61ppb |
| North Carolina | Vance County | No air monitoring |
| North Carolina | Wake County | 60ppb |
| North Carolina | Warren County | No air monitoring |
| North Carolina | Washington County | No air monitoring |
| North Carolina | Watauga County | No air monitoring |
| North Carolina | Wayne County | No air monitoring |
| North Carolina | Wilkes County | No air monitoring |
| North Carolina | Wilson County | No air monitoring |
| North Carolina | Yadkin County | No air monitoring |
| North Carolina | Yancey County | 62ppb |
| North Dakota | Adams County | No air monitoring |
| North Dakota | Barnes County | No air monitoring |
| North Dakota | Benson County | No air monitoring |
| North Dakota | Billings County | 58ppb |
| North Dakota | Bottineau County | No air monitoring |
| North Dakota | Bowman County | No air monitoring |
| North Dakota | Burke County | 55ppb |
| North Dakota | Burleigh County | No air monitoring |
| North Dakota | Cass County | 58ppb |
| North Dakota | Cavalier County | No air monitoring |
| North Dakota | Dickey County | No air monitoring |
| North Dakota | Divide County | No air monitoring |
| North Dakota | Dunn County | 58ppb |
| North Dakota | Eddy County | No air monitoring |
| North Dakota | Emmons County | No air monitoring |
| North Dakota | Foster County | No air monitoring |
| North Dakota | Golden Valley County | No air monitoring |
| North Dakota | Grand Forks County | No air monitoring |
| North Dakota | Grant County | No air monitoring |
| North Dakota | Griggs County | No air monitoring |
| North Dakota | Hettinger County | No air monitoring |
| North Dakota | Kidder County | No air monitoring |
| North Dakota | LaMoure County | No air monitoring |
| North Dakota | Logan County | No air monitoring |
| North Dakota | McHenry County | No air monitoring |
| North Dakota | McIntosh County | No air monitoring |
| North Dakota | McKenzie County | 56ppb |
| North Dakota | McLean County | No air monitoring |
| North Dakota | Mercer County | 57ppb |
| North Dakota | Morton County | No air monitoring |
| North Dakota | Mountrail County | No air monitoring |
| North Dakota | Nelson County | No air monitoring |
| North Dakota | Oliver County | 58ppb |
| North Dakota | Pembina County | No air monitoring |
| North Dakota | Pierce County | No air monitoring |
| North Dakota | Ramsey County | No air monitoring |
| North Dakota | Ransom County | No air monitoring |
| North Dakota | Renville County | No air monitoring |
| North Dakota | Richland County | No air monitoring |
| North Dakota | Rolette County | No air monitoring |
| North Dakota | Sargent County | No air monitoring |
| North Dakota | Sheridan County | No air monitoring |
| North Dakota | Sioux County | No air monitoring |
| North Dakota | Slope County | No air monitoring |
| North Dakota | Stark County | No air monitoring |
| North Dakota | Steele County | No air monitoring |
| North Dakota | Stutsman County | No air monitoring |
| North Dakota | Towner County | No air monitoring |
| North Dakota | Traill County | No air monitoring |
| North Dakota | Walsh County | No air monitoring |
| North Dakota | Ward County | 53ppb |
| North Dakota | Wells County | No air monitoring |
| North Dakota | Williams County | No air monitoring |
| Ohio | Adams County | No air monitoring |
| Ohio | Allen County | 65ppb |
| Ohio | Ashland County | No air monitoring |
| Ohio | Ashtabula County | 67ppb |
| Ohio | Athens County | No air monitoring |
| Ohio | Auglaize County | No air monitoring |
| Ohio | Belmont County | No air monitoring |
| Ohio | Brown County | No air monitoring |
| Ohio | Butler County | 67ppb |
| Ohio | Carroll County | No air monitoring |
| Ohio | Champaign County | No air monitoring |
| Ohio | Clark County | 65ppb |
| Ohio | Clermont County | 64ppb |
| Ohio | Clinton County | 62ppb |
| Ohio | Columbiana County | No air monitoring |
| Ohio | Coshocton County | No air monitoring |
| Ohio | Crawford County | No air monitoring |
| Ohio | Cuyahoga County | 72ppb |
| Ohio | Darke County | No air monitoring |
| Ohio | Defiance County | No air monitoring |
| Ohio | Delaware County | 61ppb |
| Ohio | Erie County | No air monitoring |
| Ohio | Fairfield County | No air monitoring |
| Ohio | Fayette County | No air monitoring |
| Ohio | Franklin County | 66ppb |
| Ohio | Fulton County | No air monitoring |
| Ohio | Gallia County | No air monitoring |
| Ohio | Geauga County | 65ppb |
| Ohio | Greene County | 63ppb |
| Ohio | Guernsey County | No air monitoring |
| Ohio | Hamilton County | 69ppb |
| Ohio | Hancock County | No air monitoring |
| Ohio | Hardin County | No air monitoring |
| Ohio | Harrison County | No air monitoring |
| Ohio | Henry County | No air monitoring |
| Ohio | Highland County | No air monitoring |
| Ohio | Hocking County | No air monitoring |
| Ohio | Holmes County | No air monitoring |
| Ohio | Huron County | No air monitoring |
| Ohio | Jackson County | No air monitoring |
| Ohio | Jefferson County | 62ppb |
| Ohio | Knox County | 61ppb |
| Ohio | Lake County | 74ppb |
| Ohio | Lawrence County | 58ppb |
| Ohio | Licking County | 60ppb |
| Ohio | Logan County | No air monitoring |
| Ohio | Lorain County | 60ppb |
| Ohio | Lucas County | 73ppb |
| Ohio | Madison County | 61ppb |
| Ohio | Mahoning County | 65ppb |
| Ohio | Marion County | No air monitoring |
| Ohio | Medina County | 65ppb |
| Ohio | Meigs County | No air monitoring |
| Ohio | Mercer County | No air monitoring |
| Ohio | Miami County | 63ppb |
| Ohio | Monroe County | No air monitoring |
| Ohio | Montgomery County | 68ppb |
| Ohio | Morgan County | No air monitoring |
| Ohio | Morrow County | No air monitoring |
| Ohio | Muskingum County | No air monitoring |
| Ohio | Noble County | 61ppb |
| Ohio | Ottawa County | No air monitoring |
| Ohio | Paulding County | No air monitoring |
| Ohio | Perry County | No air monitoring |
| Ohio | Pickaway County | No air monitoring |
| Ohio | Pike County | No air monitoring |
| Ohio | Portage County | 67ppb |
| Ohio | Preble County | 64ppb |
| Ohio | Putnam County | No air monitoring |
| Ohio | Richland County | No air monitoring |
| Ohio | Ross County | No air monitoring |
| Ohio | Sandusky County | No air monitoring |
| Ohio | Scioto County | No air monitoring |
| Ohio | Seneca County | No air monitoring |
| Ohio | Shelby County | No air monitoring |
| Ohio | Stark County | 65ppb |
| Ohio | Summit County | 65ppb |
| Ohio | Trumbull County | 65ppb |
| Ohio | Tuscarawas County | No air monitoring |
| Ohio | Union County | No air monitoring |
| Ohio | Van Wert County | No air monitoring |
| Ohio | Vinton County | No air monitoring |
| Ohio | Warren County | 69ppb |
| Ohio | Washington County | 60ppb |
| Ohio | Wayne County | No air monitoring |
| Ohio | Williams County | No air monitoring |
| Ohio | Wood County | 63ppb |
| Ohio | Wyandot County | No air monitoring |
| Oklahoma | Adair County | 61ppb |
| Oklahoma | Alfalfa County | No air monitoring |
| Oklahoma | Atoka County | No air monitoring |
| Oklahoma | Beaver County | No air monitoring |
| Oklahoma | Beckham County | No air monitoring |
| Oklahoma | Blaine County | No air monitoring |
| Oklahoma | Bryan County | No air monitoring |
| Oklahoma | Caddo County | No air monitoring |
| Oklahoma | Canadian County | 67ppb |
| Oklahoma | Carter County | No air monitoring |
| Oklahoma | Cherokee County | No air monitoring |
| Oklahoma | Choctaw County | No air monitoring |
| Oklahoma | Cimarron County | No air monitoring |
| Oklahoma | Cleveland County | 66ppb |
| Oklahoma | Coal County | No air monitoring |
| Oklahoma | Comanche County | 66ppb |
| Oklahoma | Cotton County | No air monitoring |
| Oklahoma | Craig County | No air monitoring |
| Oklahoma | Creek County | 65ppb |
| Oklahoma | Custer County | No air monitoring |
| Oklahoma | Delaware County | No air monitoring |
| Oklahoma | Dewey County | 64ppb |
| Oklahoma | Ellis County | No air monitoring |
| Oklahoma | Garfield County | No air monitoring |
| Oklahoma | Garvin County | No air monitoring |
| Oklahoma | Grady County | No air monitoring |
| Oklahoma | Grant County | No air monitoring |
| Oklahoma | Greer County | No air monitoring |
| Oklahoma | Harmon County | No air monitoring |
| Oklahoma | Harper County | No air monitoring |
| Oklahoma | Haskell County | No air monitoring |
| Oklahoma | Hughes County | No air monitoring |
| Oklahoma | Jackson County | No air monitoring |
| Oklahoma | Jefferson County | No air monitoring |
| Oklahoma | Johnston County | No air monitoring |
| Oklahoma | Kay County | No air monitoring |
| Oklahoma | Kingfisher County | No air monitoring |
| Oklahoma | Kiowa County | No air monitoring |
| Oklahoma | Latimer County | No air monitoring |
| Oklahoma | Le Flore County | No air monitoring |
| Oklahoma | Lincoln County | No air monitoring |
| Oklahoma | Logan County | No air monitoring |
| Oklahoma | Love County | No air monitoring |
| Oklahoma | McClain County | No air monitoring |
| Oklahoma | McCurtain County | No air monitoring |
| Oklahoma | McIntosh County | No air monitoring |
| Oklahoma | Major County | No air monitoring |
| Oklahoma | Marshall County | No air monitoring |
| Oklahoma | Mayes County | 61ppb |
| Oklahoma | Murray County | No air monitoring |
| Oklahoma | Muskogee County | No air monitoring |
| Oklahoma | Noble County | No air monitoring |
| Oklahoma | Nowata County | No air monitoring |
| Oklahoma | Okfuskee County | No air monitoring |
| Oklahoma | Oklahoma County | 70ppb |
| Oklahoma | Okmulgee County | No air monitoring |
| Oklahoma | Osage County | 67ppb |
| Oklahoma | Ottawa County | 61ppb |
| Oklahoma | Pawnee County | No air monitoring |
| Oklahoma | Payne County | No air monitoring |
| Oklahoma | Pittsburg County | 62ppb |
| Oklahoma | Pontotoc County | No air monitoring |
| Oklahoma | Pottawatomie County | No air monitoring |
| Oklahoma | Pushmataha County | No air monitoring |
| Oklahoma | Roger Mills County | No air monitoring |
| Oklahoma | Rogers County | No air monitoring |
| Oklahoma | Seminole County | No air monitoring |
| Oklahoma | Sequoyah County | 57ppb |
| Oklahoma | Stephens County | No air monitoring |
| Oklahoma | Texas County | No air monitoring |
| Oklahoma | Tillman County | No air monitoring |
| Oklahoma | Tulsa County | 66ppb |
| Oklahoma | Wagoner County | No air monitoring |
| Oklahoma | Washington County | No air monitoring |
| Oklahoma | Washita County | No air monitoring |
| Oklahoma | Woods County | No air monitoring |
| Oklahoma | Woodward County | No air monitoring |
| Oregon | Baker County | No air monitoring |
| Oregon | Benton County | No air monitoring |
| Oregon | Clackamas County | 66ppb |
| Oregon | Clatsop County | No air monitoring |
| Oregon | Columbia County | 53ppb |
| Oregon | Coos County | No air monitoring |
| Oregon | Crook County | No air monitoring |
| Oregon | Curry County | No air monitoring |
| Oregon | Deschutes County | No air monitoring |
| Oregon | Douglas County | No air monitoring |
| Oregon | Gilliam County | No air monitoring |
| Oregon | Grant County | No air monitoring |
| Oregon | Harney County | No air monitoring |
| Oregon | Hood River County | No air monitoring |
| Oregon | Jackson County | 65ppb |
| Oregon | Jefferson County | No air monitoring |
| Oregon | Josephine County | No air monitoring |
| Oregon | Klamath County | No air monitoring |
| Oregon | Lake County | No air monitoring |
| Oregon | Lane County | 58ppb |
| Oregon | Lincoln County | No air monitoring |
| Oregon | Linn County | No air monitoring |
| Oregon | Malheur County | No air monitoring |
| Oregon | Marion County | 63ppb |
| Oregon | Morrow County | No air monitoring |
| Oregon | Multnomah County | 58ppb |
| Oregon | Polk County | No air monitoring |
| Oregon | Sherman County | No air monitoring |
| Oregon | Tillamook County | No air monitoring |
| Oregon | Umatilla County | 61ppb |
| Oregon | Union County | No air monitoring |
| Oregon | Wallowa County | No air monitoring |
| Oregon | Wasco County | No air monitoring |
| Oregon | Washington County | 58ppb |
| Oregon | Wheeler County | No air monitoring |
| Oregon | Yamhill County | No air monitoring |
| Pennsylvania | Adams County | 62ppb |
| Pennsylvania | Allegheny County | 67ppb |
| Pennsylvania | Armstrong County | 66ppb |
| Pennsylvania | Beaver County | 64ppb |
| Pennsylvania | Bedford County | No air monitoring |
| Pennsylvania | Berks County | 60ppb |
| Pennsylvania | Blair County | No air monitoring |
| Pennsylvania | Bradford County | 58ppb |
| Pennsylvania | Bucks County | 72ppb |
| Pennsylvania | Butler County | No air monitoring |
| Pennsylvania | Cambria County | 62ppb |
| Pennsylvania | Cameron County | No air monitoring |
| Pennsylvania | Carbon County | No air monitoring |
| Pennsylvania | Centre County | 61ppb |
| Pennsylvania | Chester County | No air monitoring |
| Pennsylvania | Clarion County | No air monitoring |
| Pennsylvania | Clearfield County | 54ppb |
| Pennsylvania | Clinton County | No air monitoring |
| Pennsylvania | Columbia County | No air monitoring |
| Pennsylvania | Crawford County | No air monitoring |
| Pennsylvania | Cumberland County | No air monitoring |
| Pennsylvania | Dauphin County | 61ppb |
| Pennsylvania | Delaware County | No air monitoring |
| Pennsylvania | Elk County | 58ppb |
| Pennsylvania | Erie County | 59ppb |
| Pennsylvania | Fayette County | 58ppb |
| Pennsylvania | Forest County | No air monitoring |
| Pennsylvania | Franklin County | 56ppb |
| Pennsylvania | Fulton County | No air monitoring |
| Pennsylvania | Greene County | No air monitoring |
| Pennsylvania | Huntingdon County | No air monitoring |
| Pennsylvania | Indiana County | 63ppb |
| Pennsylvania | Jefferson County | No air monitoring |
| Pennsylvania | Juniata County | No air monitoring |
| Pennsylvania | Lackawanna County | 59ppb |
| Pennsylvania | Lancaster County | 62ppb |
| Pennsylvania | Lawrence County | 61ppb |
| Pennsylvania | Lebanon County | No air monitoring |
| Pennsylvania | Lehigh County | 61ppb |
| Pennsylvania | Luzerne County | No air monitoring |
| Pennsylvania | Lycoming County | 57ppb |
| Pennsylvania | Mc Kean County | No air monitoring |
| Pennsylvania | Mercer County | 65ppb |
| Pennsylvania | Mifflin County | No air monitoring |
| Pennsylvania | Monroe County | No air monitoring |
| Pennsylvania | Montgomery County | No air monitoring |
| Pennsylvania | Montour County | No air monitoring |
| Pennsylvania | Northampton County | 64ppb |
| Pennsylvania | Northumberland County | No air monitoring |
| Pennsylvania | Perry County | No air monitoring |
| Pennsylvania | Philadelphia County | 70ppb |
| Pennsylvania | Pike County | No air monitoring |
| Pennsylvania | Potter County | No air monitoring |
| Pennsylvania | Schuylkill County | No air monitoring |
| Pennsylvania | Snyder County | No air monitoring |
| Pennsylvania | Somerset County | 59ppb |
| Pennsylvania | Sullivan County | No air monitoring |
| Pennsylvania | Susquehanna County | No air monitoring |
| Pennsylvania | Tioga County | 59ppb |
| Pennsylvania | Union County | No air monitoring |
| Pennsylvania | Venango County | No air monitoring |
| Pennsylvania | Warren County | No air monitoring |
| Pennsylvania | Washington County | 61ppb |
| Pennsylvania | Wayne County | No air monitoring |
| Pennsylvania | Westmoreland County | 51ppb |
| Pennsylvania | Wyoming County | No air monitoring |
| Pennsylvania | York County | 60ppb |
| Rhode Island | Rhode Island | No air monitoring |
| Rhode Island | Bristol County | No air monitoring |
| Rhode Island | Kent County | 64ppb |
| Rhode Island | Newport County | No air monitoring |
| Rhode Island | Providence County | 65ppb |
| Rhode Island | Washington County | 66ppb |
| South Carolina | Abbeville County | No air monitoring |
| South Carolina | Aiken County | 58ppb |
| South Carolina | Allendale County | No air monitoring |
| South Carolina | Anderson County | 58ppb |
| South Carolina | Bamberg County | No air monitoring |
| South Carolina | Barnwell County | No air monitoring |
| South Carolina | Beaufort County | No air monitoring |
| South Carolina | Berkeley County | 57ppb |
| South Carolina | Calhoun County | No air monitoring |
| South Carolina | Charleston County | No air monitoring |
| South Carolina | Cherokee County | No air monitoring |
| South Carolina | Chester County | No air monitoring |
| South Carolina | Chesterfield County | 59ppb |
| South Carolina | Clarendon County | No air monitoring |
| South Carolina | Colleton County | No air monitoring |
| South Carolina | Darlington County | 57ppb |
| South Carolina | Dillon County | No air monitoring |
| South Carolina | Dorchester County | No air monitoring |
| South Carolina | Edgefield County | 58ppb |
| South Carolina | Fairfield County | No air monitoring |
| South Carolina | Florence County | No air monitoring |
| South Carolina | Georgetown County | No air monitoring |
| South Carolina | Greenville County | 64ppb |
| South Carolina | Greenwood County | No air monitoring |
| South Carolina | Hampton County | No air monitoring |
| South Carolina | Horry County | 58ppb |
| South Carolina | Jasper County | No air monitoring |
| South Carolina | Kershaw County | No air monitoring |
| South Carolina | Lancaster County | No air monitoring |
| South Carolina | Laurens County | No air monitoring |
| South Carolina | Lee County | No air monitoring |
| South Carolina | Lexington County | No air monitoring |
| South Carolina | McCormick County | No air monitoring |
| South Carolina | Marion County | No air monitoring |
| South Carolina | Marlboro County | No air monitoring |
| South Carolina | Newberry County | No air monitoring |
| South Carolina | Oconee County | No air monitoring |
| South Carolina | Orangeburg County | No air monitoring |
| South Carolina | Pickens County | No air monitoring |
| South Carolina | Richland County | 61ppb |
| South Carolina | Saluda County | No air monitoring |
| South Carolina | Spartanburg County | 63ppb |
| South Carolina | Sumter County | No air monitoring |
| South Carolina | Union County | No air monitoring |
| South Carolina | Williamsburg County | No air monitoring |
| South Carolina | York County | 60ppb |
| South Dakota | Aurora County | No air monitoring |
| South Dakota | Beadle County | No air monitoring |
| South Dakota | Bennett County | No air monitoring |
| South Dakota | Bon Homme County | No air monitoring |
| South Dakota | Brookings County | No air monitoring |
| South Dakota | Brown County | No air monitoring |
| South Dakota | Brule County | No air monitoring |
| South Dakota | Buffalo County | No air monitoring |
| South Dakota | Butte County | No air monitoring |
| South Dakota | Campbell County | No air monitoring |
| South Dakota | Charles Mix County | No air monitoring |
| South Dakota | Clark County | No air monitoring |
| South Dakota | Clay County | No air monitoring |
| South Dakota | Codington County | 63ppb |
| South Dakota | Corson County | No air monitoring |
| South Dakota | Custer County | 63ppb |
| South Dakota | Davison County | No air monitoring |
| South Dakota | Day County | No air monitoring |
| South Dakota | Deuel County | No air monitoring |
| South Dakota | Dewey County | No air monitoring |
| South Dakota | Douglas County | No air monitoring |
| South Dakota | Edmunds County | No air monitoring |
| South Dakota | Fall River County | No air monitoring |
| South Dakota | Faulk County | No air monitoring |
| South Dakota | Grant County | No air monitoring |
| South Dakota | Gregory County | No air monitoring |
| South Dakota | Haakon County | No air monitoring |
| South Dakota | Hamlin County | No air monitoring |
| South Dakota | Hand County | No air monitoring |
| South Dakota | Hanson County | No air monitoring |
| South Dakota | Harding County | No air monitoring |
| South Dakota | Hughes County | No air monitoring |
| South Dakota | Hutchinson County | No air monitoring |
| South Dakota | Hyde County | No air monitoring |
| South Dakota | Jackson County | 60ppb |
| South Dakota | Jerauld County | No air monitoring |
| South Dakota | Jones County | No air monitoring |
| South Dakota | Kingsbury County | No air monitoring |
| South Dakota | Lake County | No air monitoring |
| South Dakota | Lawrence County | No air monitoring |
| South Dakota | Lincoln County | No air monitoring |
| South Dakota | Lyman County | No air monitoring |
| South Dakota | McCook County | No air monitoring |
| South Dakota | McPherson County | No air monitoring |
| South Dakota | Marshall County | No air monitoring |
| South Dakota | Meade County | 64ppb |
| South Dakota | Mellette County | No air monitoring |
| South Dakota | Miner County | No air monitoring |
| South Dakota | Minnehaha County | No air monitoring |
| South Dakota | Moody County | No air monitoring |
| South Dakota | Pennington County | No air monitoring |
| South Dakota | Perkins County | No air monitoring |
| South Dakota | Potter County | No air monitoring |
| South Dakota | Roberts County | No air monitoring |
| South Dakota | Sanborn County | No air monitoring |
| South Dakota | Shannon County | No air monitoring |
| South Dakota | Spink County | No air monitoring |
| South Dakota | Stanley County | No air monitoring |
| South Dakota | Sully County | No air monitoring |
| South Dakota | Todd County | No air monitoring |
| South Dakota | Tripp County | No air monitoring |
| South Dakota | Turner County | No air monitoring |
| South Dakota | Union County | No air monitoring |
| South Dakota | Walworth County | No air monitoring |
| South Dakota | Yankton County | No air monitoring |
| South Dakota | Ziebach County | No air monitoring |
| Tennessee | Anderson County | 58ppb |
| Tennessee | Bedford County | No air monitoring |
| Tennessee | Benton County | No air monitoring |
| Tennessee | Bledsoe County | No air monitoring |
| Tennessee | Blount County | 63ppb |
| Tennessee | Bradley County | No air monitoring |
| Tennessee | Campbell County | No air monitoring |
| Tennessee | Cannon County | No air monitoring |
| Tennessee | Carroll County | No air monitoring |
| Tennessee | Carter County | No air monitoring |
| Tennessee | Cheatham County | No air monitoring |
| Tennessee | Chester County | No air monitoring |
| Tennessee | Claiborne County | 56ppb |
| Tennessee | Clay County | No air monitoring |
| Tennessee | Cocke County | No air monitoring |
| Tennessee | Coffee County | No air monitoring |
| Tennessee | Crockett County | No air monitoring |
| Tennessee | Cumberland County | No air monitoring |
| Tennessee | Davidson County | 64ppb |
| Tennessee | Decatur County | No air monitoring |
| Tennessee | DeKalb County | 57ppb |
| Tennessee | Dickson County | No air monitoring |
| Tennessee | Dyer County | No air monitoring |
| Tennessee | Fayette County | No air monitoring |
| Tennessee | Fentress County | No air monitoring |
| Tennessee | Franklin County | No air monitoring |
| Tennessee | Gibson County | No air monitoring |
| Tennessee | Giles County | No air monitoring |
| Tennessee | Grainger County | No air monitoring |
| Tennessee | Greene County | No air monitoring |
| Tennessee | Grundy County | No air monitoring |
| Tennessee | Hamblen County | No air monitoring |
| Tennessee | Hamilton County | 63ppb |
| Tennessee | Hancock County | No air monitoring |
| Tennessee | Hardeman County | No air monitoring |
| Tennessee | Hardin County | No air monitoring |
| Tennessee | Hawkins County | No air monitoring |
| Tennessee | Haywood County | No air monitoring |
| Tennessee | Henderson County | No air monitoring |
| Tennessee | Henry County | No air monitoring |
| Tennessee | Hickman County | No air monitoring |
| Tennessee | Houston County | No air monitoring |
| Tennessee | Humphreys County | No air monitoring |
| Tennessee | Jackson County | No air monitoring |
| Tennessee | Jefferson County | 61ppb |
| Tennessee | Johnson County | No air monitoring |
| Tennessee | Knox County | 58ppb |
| Tennessee | Lake County | No air monitoring |
| Tennessee | Lauderdale County | No air monitoring |
| Tennessee | Lawrence County | No air monitoring |
| Tennessee | Lewis County | No air monitoring |
| Tennessee | Lincoln County | No air monitoring |
| Tennessee | Loudon County | 60ppb |
| Tennessee | McMinn County | No air monitoring |
| Tennessee | McNairy County | No air monitoring |
| Tennessee | Macon County | No air monitoring |
| Tennessee | Madison County | No air monitoring |
| Tennessee | Marion County | No air monitoring |
| Tennessee | Marshall County | No air monitoring |
| Tennessee | Maury County | No air monitoring |
| Tennessee | Meigs County | No air monitoring |
| Tennessee | Monroe County | No air monitoring |
| Tennessee | Montgomery County | No air monitoring |
| Tennessee | Moore County | No air monitoring |
| Tennessee | Morgan County | No air monitoring |
| Tennessee | Obion County | No air monitoring |
| Tennessee | Overton County | No air monitoring |
| Tennessee | Perry County | No air monitoring |
| Tennessee | Pickett County | No air monitoring |
| Tennessee | Polk County | No air monitoring |
| Tennessee | Putnam County | No air monitoring |
| Tennessee | Rhea County | No air monitoring |
| Tennessee | Roane County | No air monitoring |
| Tennessee | Robertson County | No air monitoring |
| Tennessee | Rutherford County | No air monitoring |
| Tennessee | Scott County | No air monitoring |
| Tennessee | Sequatchie County | No air monitoring |
| Tennessee | Sevier County | 61ppb |
| Tennessee | Shelby County | 69ppb |
| Tennessee | Smith County | No air monitoring |
| Tennessee | Stewart County | No air monitoring |
| Tennessee | Sullivan County | 60ppb |
| Tennessee | Sumner County | 64ppb |
| Tennessee | Tipton County | No air monitoring |
| Tennessee | Trousdale County | No air monitoring |
| Tennessee | Unicoi County | No air monitoring |
| Tennessee | Union County | No air monitoring |
| Tennessee | Van Buren County | No air monitoring |
| Tennessee | Warren County | No air monitoring |
| Tennessee | Washington County | No air monitoring |
| Tennessee | Wayne County | No air monitoring |
| Tennessee | Weakley County | No air monitoring |
| Tennessee | White County | No air monitoring |
| Tennessee | Williamson County | 61ppb |
| Tennessee | Wilson County | 60ppb |
| Texas | Anderson County | No air monitoring |
| Texas | Andrews County | No air monitoring |
| Texas | Angelina County | No air monitoring |
| Texas | Aransas County | No air monitoring |
| Texas | Archer County | No air monitoring |
| Texas | Armstrong County | No air monitoring |
| Texas | Atascosa County | No air monitoring |
| Texas | Austin County | No air monitoring |
| Texas | Bailey County | No air monitoring |
| Texas | Bandera County | No air monitoring |
| Texas | Bastrop County | No air monitoring |
| Texas | Baylor County | No air monitoring |
| Texas | Bee County | No air monitoring |
| Texas | Bell County | 67ppb |
| Texas | Bexar County | 75ppb |
| Texas | Blanco County | No air monitoring |
| Texas | Borden County | No air monitoring |
| Texas | Bosque County | No air monitoring |
| Texas | Bowie County | No air monitoring |
| Texas | Brazoria County | 73ppb |
| Texas | Brazos County | No air monitoring |
| Texas | Brewster County | 61ppb |
| Texas | Briscoe County | No air monitoring |
| Texas | Brooks County | No air monitoring |
| Texas | Brown County | No air monitoring |
| Texas | Burleson County | No air monitoring |
| Texas | Burnet County | No air monitoring |
| Texas | Caldwell County | No air monitoring |
| Texas | Calhoun County | No air monitoring |
| Texas | Callahan County | No air monitoring |
| Texas | Cameron County | 55ppb |
| Texas | Camp County | No air monitoring |
| Texas | Carson County | No air monitoring |
| Texas | Cass County | No air monitoring |
| Texas | Castro County | No air monitoring |
| Texas | Chambers County | No air monitoring |
| Texas | Cherokee County | No air monitoring |
| Texas | Childress County | No air monitoring |
| Texas | Clay County | No air monitoring |
| Texas | Cochran County | No air monitoring |
| Texas | Coke County | No air monitoring |
| Texas | Coleman County | No air monitoring |
| Texas | Collin County | 74ppb |
| Texas | Collingsworth County | No air monitoring |
| Texas | Colorado County | No air monitoring |
| Texas | Comal County | No air monitoring |
| Texas | Comanche County | No air monitoring |
| Texas | Concho County | No air monitoring |
| Texas | Cooke County | No air monitoring |
| Texas | Coryell County | No air monitoring |
| Texas | Cottle County | No air monitoring |
| Texas | Crane County | No air monitoring |
| Texas | Crockett County | No air monitoring |
| Texas | Crosby County | No air monitoring |
| Texas | Culberson County | No air monitoring |
| Texas | Dallam County | No air monitoring |
| Texas | Dallas County | 71ppb |
| Texas | Dawson County | No air monitoring |
| Texas | Deaf Smith County | No air monitoring |
| Texas | Delta County | No air monitoring |
| Texas | Denton County | 77ppb |
| Texas | DeWitt County | No air monitoring |
| Texas | Dickens County | No air monitoring |
| Texas | Dimmit County | No air monitoring |
| Texas | Donley County | No air monitoring |
| Texas | Duval County | No air monitoring |
| Texas | Eastland County | No air monitoring |
| Texas | Ector County | No air monitoring |
| Texas | Edwards County | No air monitoring |
| Texas | Ellis County | 63ppb |
| Texas | El Paso County | 73ppb |
| Texas | Erath County | No air monitoring |
| Texas | Falls County | No air monitoring |
| Texas | Fannin County | No air monitoring |
| Texas | Fayette County | No air monitoring |
| Texas | Fisher County | No air monitoring |
| Texas | Floyd County | No air monitoring |
| Texas | Foard County | No air monitoring |
| Texas | Fort Bend County | No air monitoring |
| Texas | Franklin County | No air monitoring |
| Texas | Freestone County | No air monitoring |
| Texas | Frio County | No air monitoring |
| Texas | Gaines County | No air monitoring |
| Texas | Galveston County | 70ppb |
| Texas | Garza County | No air monitoring |
| Texas | Gillespie County | No air monitoring |
| Texas | Glasscock County | No air monitoring |
| Texas | Goliad County | No air monitoring |
| Texas | Gonzales County | No air monitoring |
| Texas | Gray County | No air monitoring |
| Texas | Grayson County | No air monitoring |
| Texas | Gregg County | 61ppb |
| Texas | Grimes County | No air monitoring |
| Texas | Guadalupe County | No air monitoring |
| Texas | Hale County | No air monitoring |
| Texas | Hall County | No air monitoring |
| Texas | Hamilton County | No air monitoring |
| Texas | Hansford County | No air monitoring |
| Texas | Hardeman County | No air monitoring |
| Texas | Hardin County | No air monitoring |
| Texas | Harris County | 78ppb |
| Texas | Harrison County | 60ppb |
| Texas | Hartley County | No air monitoring |
| Texas | Haskell County | No air monitoring |
| Texas | Hays County | No air monitoring |
| Texas | Hemphill County | No air monitoring |
| Texas | Henderson County | No air monitoring |
| Texas | Hidalgo County | No air monitoring |
| Texas | Hill County | No air monitoring |
| Texas | Hockley County | No air monitoring |
| Texas | Hood County | 69ppb |
| Texas | Hopkins County | No air monitoring |
| Texas | Houston County | No air monitoring |
| Texas | Howard County | No air monitoring |
| Texas | Hudspeth County | No air monitoring |
| Texas | Hunt County | 63ppb |
| Texas | Hutchinson County | No air monitoring |
| Texas | Irion County | No air monitoring |
| Texas | Jack County | No air monitoring |
| Texas | Jackson County | No air monitoring |
| Texas | Jasper County | No air monitoring |
| Texas | Jeff Davis County | No air monitoring |
| Texas | Jefferson County | 63ppb |
| Texas | Jim Hogg County | No air monitoring |
| Texas | Jim Wells County | No air monitoring |
| Texas | Johnson County | 74ppb |
| Texas | Jones County | No air monitoring |
| Texas | Karnes County | No air monitoring |
| Texas | Kaufman County | 66ppb |
| Texas | Kendall County | No air monitoring |
| Texas | Kenedy County | No air monitoring |
| Texas | Kent County | No air monitoring |
| Texas | Kerr County | No air monitoring |
| Texas | Kimble County | No air monitoring |
| Texas | King County | No air monitoring |
| Texas | Kinney County | No air monitoring |
| Texas | Kleberg County | No air monitoring |
| Texas | Knox County | No air monitoring |
| Texas | Lamar County | No air monitoring |
| Texas | Lamb County | No air monitoring |
| Texas | Lampasas County | No air monitoring |
| Texas | La Salle County | No air monitoring |
| Texas | Lavaca County | No air monitoring |
| Texas | Lee County | No air monitoring |
| Texas | Leon County | No air monitoring |
| Texas | Liberty County | No air monitoring |
| Texas | Limestone County | No air monitoring |
| Texas | Lipscomb County | No air monitoring |
| Texas | Live Oak County | No air monitoring |
| Texas | Llano County | No air monitoring |
| Texas | Loving County | No air monitoring |
| Texas | Lubbock County | No air monitoring |
| Texas | Lynn County | No air monitoring |
| Texas | McCulloch County | No air monitoring |
| Texas | McLennan County | 64ppb |
| Texas | McMullen County | No air monitoring |
| Texas | Madison County | No air monitoring |
| Texas | Marion County | No air monitoring |
| Texas | Martin County | No air monitoring |
| Texas | Mason County | No air monitoring |
| Texas | Matagorda County | No air monitoring |
| Texas | Maverick County | No air monitoring |
| Texas | Medina County | No air monitoring |
| Texas | Menard County | No air monitoring |
| Texas | Midland County | No air monitoring |
| Texas | Milam County | No air monitoring |
| Texas | Mills County | No air monitoring |
| Texas | Mitchell County | No air monitoring |
| Texas | Montague County | No air monitoring |
| Texas | Montgomery County | 72ppb |
| Texas | Moore County | No air monitoring |
| Texas | Morris County | No air monitoring |
| Texas | Motley County | No air monitoring |
| Texas | Nacogdoches County | No air monitoring |
| Texas | Navarro County | 65ppb |
| Texas | Newton County | No air monitoring |
| Texas | Nolan County | No air monitoring |
| Texas | Nueces County | 62ppb |
| Texas | Ochiltree County | No air monitoring |
| Texas | Oldham County | No air monitoring |
| Texas | Orange County | 61ppb |
| Texas | Palo Pinto County | No air monitoring |
| Texas | Panola County | No air monitoring |
| Texas | Parker County | 70ppb |
| Texas | Parmer County | No air monitoring |
| Texas | Pecos County | No air monitoring |
| Texas | Polk County | 57ppb |
| Texas | Potter County | No air monitoring |
| Texas | Presidio County | No air monitoring |
| Texas | Rains County | No air monitoring |
| Texas | Randall County | 67ppb |
| Texas | Reagan County | No air monitoring |
| Texas | Real County | No air monitoring |
| Texas | Red River County | No air monitoring |
| Texas | Reeves County | No air monitoring |
| Texas | Refugio County | No air monitoring |
| Texas | Roberts County | No air monitoring |
| Texas | Robertson County | No air monitoring |
| Texas | Rockwall County | 63ppb |
| Texas | Runnels County | No air monitoring |
| Texas | Rusk County | No air monitoring |
| Texas | Sabine County | No air monitoring |
| Texas | San Augustine County | No air monitoring |
| Texas | San Jacinto County | No air monitoring |
| Texas | San Patricio County | No air monitoring |
| Texas | San Saba County | No air monitoring |
| Texas | Schleicher County | No air monitoring |
| Texas | Scurry County | No air monitoring |
| Texas | Shackelford County | No air monitoring |
| Texas | Shelby County | No air monitoring |
| Texas | Sherman County | No air monitoring |
| Texas | Smith County | 65ppb |
| Texas | Somervell County | No air monitoring |
| Texas | Starr County | No air monitoring |
| Texas | Stephens County | No air monitoring |
| Texas | Sterling County | No air monitoring |
| Texas | Stonewall County | No air monitoring |
| Texas | Sutton County | No air monitoring |
| Texas | Swisher County | No air monitoring |
| Texas | Tarrant County | 77ppb |
| Texas | Taylor County | No air monitoring |
| Texas | Terrell County | No air monitoring |
| Texas | Terry County | No air monitoring |
| Texas | Throckmorton County | No air monitoring |
| Texas | Titus County | No air monitoring |
| Texas | Tom Green County | No air monitoring |
| Texas | Travis County | 64ppb |
| Texas | Trinity County | No air monitoring |
| Texas | Tyler County | No air monitoring |
| Texas | Upshur County | No air monitoring |
| Texas | Upton County | No air monitoring |
| Texas | Uvalde County | No air monitoring |
| Texas | Val Verde County | No air monitoring |
| Texas | Van Zandt County | No air monitoring |
| Texas | Victoria County | 60ppb |
| Texas | Walker County | No air monitoring |
| Texas | Waller County | No air monitoring |
| Texas | Ward County | No air monitoring |
| Texas | Washington County | No air monitoring |
| Texas | Webb County | No air monitoring |
| Texas | Wharton County | No air monitoring |
| Texas | Wheeler County | No air monitoring |
| Texas | Wichita County | No air monitoring |
| Texas | Wilbarger County | No air monitoring |
| Texas | Willacy County | No air monitoring |
| Texas | Williamson County | No air monitoring |
| Texas | Wilson County | No air monitoring |
| Texas | Winkler County | No air monitoring |
| Texas | Wise County | No air monitoring |
| Texas | Wood County | No air monitoring |
| Texas | Yoakum County | No air monitoring |
| Texas | Young County | No air monitoring |
| Texas | Zapata County | No air monitoring |
| Texas | Zavala County | No air monitoring |
| Utah | Beaver County | No air monitoring |
| Utah | Box Elder County | No air monitoring |
| Utah | Cache County | 66ppb |
| Utah | Carbon County | 66ppb |
| Utah | Daggett County | No air monitoring |
| Utah | Davis County | 79ppb |
| Utah | Duchesne County | 67ppb |
| Utah | Emery County | No air monitoring |
| Utah | Garfield County | No air monitoring |
| Utah | Grand County | No air monitoring |
| Utah | Iron County | 62ppb |
| Utah | Juab County | No air monitoring |
| Utah | Kane County | No air monitoring |
| Utah | Millard County | No air monitoring |
| Utah | Morgan County | No air monitoring |
| Utah | Piute County | No air monitoring |
| Utah | Rich County | No air monitoring |
| Utah | Salt Lake County | 78ppb |
| Utah | San Juan County | 66ppb |
| Utah | Sanpete County | No air monitoring |
| Utah | Sevier County | No air monitoring |
| Utah | Summit County | No air monitoring |
| Utah | Tooele County | 71ppb |
| Utah | Uintah County | 67ppb |
| Utah | Utah County | 73ppb |
| Utah | Wasatch County | No air monitoring |
| Utah | Washington County | 66ppb |
| Utah | Wayne County | No air monitoring |
| Utah | Weber County | 74ppb |
| Vermont | Addison County | No air monitoring |
| Vermont | Bennington County | 57ppb |
| Vermont | Caledonia County | No air monitoring |
| Vermont | Chittenden County | 58ppb |
| Vermont | Essex County | No air monitoring |
| Vermont | Franklin County | No air monitoring |
| Vermont | Grand Isle County | No air monitoring |
| Vermont | Lamoille County | No air monitoring |
| Vermont | Orange County | No air monitoring |
| Vermont | Orleans County | No air monitoring |
| Vermont | Rutland County | 54ppb |
| Vermont | Washington County | No air monitoring |
| Vermont | Windham County | No air monitoring |
| Vermont | Windsor County | No air monitoring |
| Virginia | Accomack County | No air monitoring |
| Virginia | Albemarle County | 57ppb |
| Virginia | Alleghany County | No air monitoring |
| Virginia | Amelia County | No air monitoring |
| Virginia | Amherst County | No air monitoring |
| Virginia | Appomattox County | No air monitoring |
| Virginia | Arlington County | 64ppb |
| Virginia | Augusta County | No air monitoring |
| Virginia | Bath County | No air monitoring |
| Virginia | Bedford County | No air monitoring |
| Virginia | Bland County | No air monitoring |
| Virginia | Botetourt County | No air monitoring |
| Virginia | Brunswick County | No air monitoring |
| Virginia | Buchanan County | No air monitoring |
| Virginia | Buckingham County | No air monitoring |
| Virginia | Campbell County | No air monitoring |
| Virginia | Caroline County | 58ppb |
| Virginia | Carroll County | No air monitoring |
| Virginia | Charles City County | 57ppb |
| Virginia | Charlotte County | No air monitoring |
| Virginia | Chesterfield County | 58ppb |
| Virginia | Clarke County | No air monitoring |
| Virginia | Craig County | No air monitoring |
| Virginia | Culpeper County | No air monitoring |
| Virginia | Cumberland County | No air monitoring |
| Virginia | Dickenson County | No air monitoring |
| Virginia | Dinwiddie County | No air monitoring |
| Virginia | Essex County | No air monitoring |
| Virginia | Fairfax County | 62ppb |
| Virginia | Fauquier County | 55ppb |
| Virginia | Floyd County | No air monitoring |
| Virginia | Fluvanna County | No air monitoring |
| Virginia | Franklin County | No air monitoring |
| Virginia | Frederick County | 55ppb |
| Virginia | Giles County | 59ppb |
| Virginia | Gloucester County | No air monitoring |
| Virginia | Goochland County | No air monitoring |
| Virginia | Grayson County | No air monitoring |
| Virginia | Greene County | No air monitoring |
| Virginia | Greensville County | No air monitoring |
| Virginia | Halifax County | No air monitoring |
| Virginia | Hanover County | 58ppb |
| Virginia | Henrico County | 59ppb |
| Virginia | Henry County | No air monitoring |
| Virginia | Highland County | No air monitoring |
| Virginia | Isle of Wight County | No air monitoring |
| Virginia | James City County | No air monitoring |
| Virginia | King and Queen County | No air monitoring |
| Virginia | King George County | No air monitoring |
| Virginia | King William County | No air monitoring |
| Virginia | Lancaster County | No air monitoring |
| Virginia | Lee County | No air monitoring |
| Virginia | Loudoun County | 62ppb |
| Virginia | Louisa County | No air monitoring |
| Virginia | Lunenburg County | No air monitoring |
| Virginia | Madison County | 58ppb |
| Virginia | Mathews County | No air monitoring |
| Virginia | Mecklenburg County | No air monitoring |
| Virginia | Middlesex County | No air monitoring |
| Virginia | Montgomery County | No air monitoring |
| Virginia | Nelson County | No air monitoring |
| Virginia | New Kent County | No air monitoring |
| Virginia | Northampton County | No air monitoring |
| Virginia | Northumberland County | No air monitoring |
| Virginia | Nottoway County | No air monitoring |
| Virginia | Orange County | No air monitoring |
| Virginia | Page County | No air monitoring |
| Virginia | Patrick County | No air monitoring |
| Virginia | Pittsylvania County | No air monitoring |
| Virginia | Powhatan County | No air monitoring |
| Virginia | Prince Edward County | 55ppb |
| Virginia | Prince George County | No air monitoring |
| Virginia | Prince William County | 59ppb |
| Virginia | Pulaski County | No air monitoring |
| Virginia | Rappahannock County | No air monitoring |
| Virginia | Richmond County | No air monitoring |
| Virginia | Roanoke County | 57ppb |
| Virginia | Rockbridge County | 53ppb |
| Virginia | Rockingham County | 57ppb |
| Virginia | Russell County | No air monitoring |
| Virginia | Scott County | No air monitoring |
| Virginia | Shenandoah County | No air monitoring |
| Virginia | Smyth County | No air monitoring |
| Virginia | Southampton County | No air monitoring |
| Virginia | Spotsylvania County | No air monitoring |
| Virginia | Stafford County | 58ppb |
| Virginia | Surry County | No air monitoring |
| Virginia | Sussex County | No air monitoring |
| Virginia | Tazewell County | No air monitoring |
| Virginia | Warren County | No air monitoring |
| Virginia | Washington County | No air monitoring |
| Virginia | Westmoreland County | No air monitoring |
| Virginia | Wise County | No air monitoring |
| Virginia | Wythe County | 57ppb |
| Virginia | York County | No air monitoring |
| Virginia | Alexandria city | No air monitoring |
| Virginia | Bedford city | No air monitoring |
| Virginia | Bristol city | No air monitoring |
| Virginia | Buena Vista city | No air monitoring |
| Virginia | Charlottesville city | No air monitoring |
| Virginia | Chesapeake city | No air monitoring |
| Virginia | Clifton Forge city | No air monitoring |
| Virginia | Colonial Heights city | No air monitoring |
| Virginia | Covington city | No air monitoring |
| Virginia | Danville city | No air monitoring |
| Virginia | Emporia city | No air monitoring |
| Virginia | Fairfax city | No air monitoring |
| Virginia | Falls Church city | No air monitoring |
| Virginia | Franklin city | No air monitoring |
| Virginia | Fredericksburg city | No air monitoring |
| Virginia | Galax city | No air monitoring |
| Virginia | Hampton city | 58ppb |
| Virginia | Harrisonburg city | No air monitoring |
| Virginia | Hopewell city | No air monitoring |
| Virginia | Lexington city | No air monitoring |
| Virginia | Lynchburg city | No air monitoring |
| Virginia | Manassas city | No air monitoring |
| Virginia | Manassas Park city | No air monitoring |
| Virginia | Martinsville city | No air monitoring |
| Virginia | Newport News city | No air monitoring |
| Virginia | Norfolk city | No air monitoring |
| Virginia | Norton city | No air monitoring |
| Virginia | Petersburg city | No air monitoring |
| Virginia | Poquoson city | No air monitoring |
| Virginia | Portsmouth city | No air monitoring |
| Virginia | Radford city | No air monitoring |
| Virginia | Richmond city | No air monitoring |
| Virginia | Roanoke city | No air monitoring |
| Virginia | Salem city | No air monitoring |
| Virginia | South Boston city(After 1990, part of Halifax County) | No air monitoring |
| Virginia | Staunton city | No air monitoring |
| Virginia | Suffolk city | 56ppb |
| Virginia | Virginia Beach city | No air monitoring |
| Virginia | Waynesboro city | No air monitoring |
| Virginia | Williamsburg city | No air monitoring |
| Virginia | Winchester city | No air monitoring |
| Washington | Adams County | No air monitoring |
| Washington | Asotin County | No air monitoring |
| Washington | Benton County | 64ppb |
| Washington | Chelan County | No air monitoring |
| Washington | Clallam County | No air monitoring |
| Washington | Clark County | No air monitoring |
| Washington | Columbia County | No air monitoring |
| Washington | Cowlitz County | No air monitoring |
| Washington | Douglas County | No air monitoring |
| Washington | Ferry County | No air monitoring |
| Washington | Franklin County | No air monitoring |
| Washington | Garfield County | No air monitoring |
| Washington | Grant County | No air monitoring |
| Washington | Grays Harbor County | No air monitoring |
| Washington | Island County | No air monitoring |
| Washington | Jefferson County | No air monitoring |
| Washington | King County | 70ppb |
| Washington | Kitsap County | No air monitoring |
| Washington | Kittitas County | No air monitoring |
| Washington | Klickitat County | No air monitoring |
| Washington | Lewis County | No air monitoring |
| Washington | Lincoln County | No air monitoring |
| Washington | Mason County | No air monitoring |
| Washington | Okanogan County | No air monitoring |
| Washington | Pacific County | No air monitoring |
| Washington | Pend Oreille County | No air monitoring |
| Washington | Pierce County | 59ppb |
| Washington | San Juan County | No air monitoring |
| Washington | Skagit County | No air monitoring |
| Washington | Skamania County | No air monitoring |
| Washington | Snohomish County | No air monitoring |
| Washington | Spokane County | 61ppb |
| Washington | Stevens County | No air monitoring |
| Washington | Thurston County | No air monitoring |
| Washington | Wahkiakum County | No air monitoring |
| Washington | Walla Walla County | No air monitoring |
| Washington | Whatcom County | No air monitoring |
| Washington | Whitman County | No air monitoring |
| Washington | Yakima County | No air monitoring |
| West Virginia | Barbour County | No air monitoring |
| West Virginia | Berkeley County | 56ppb |
| West Virginia | Boone County | No air monitoring |
| West Virginia | Braxton County | No air monitoring |
| West Virginia | Brooke County | No air monitoring |
| West Virginia | Cabell County | No air monitoring |
| West Virginia | Calhoun County | No air monitoring |
| West Virginia | Clay County | No air monitoring |
| West Virginia | Doddridge County | No air monitoring |
| West Virginia | Fayette County | No air monitoring |
| West Virginia | Gilmer County | No air monitoring |
| West Virginia | Grant County | No air monitoring |
| West Virginia | Greenbrier County | 54ppb |
| West Virginia | Hampshire County | No air monitoring |
| West Virginia | Hancock County | 64ppb |
| West Virginia | Hardy County | No air monitoring |
| West Virginia | Harrison County | No air monitoring |
| West Virginia | Jackson County | No air monitoring |
| West Virginia | Jefferson County | No air monitoring |
| West Virginia | Kanawha County | No air monitoring |
| West Virginia | Lewis County | No air monitoring |
| West Virginia | Lincoln County | No air monitoring |
| West Virginia | Logan County | No air monitoring |
| West Virginia | McDowell County | No air monitoring |
| West Virginia | Marion County | No air monitoring |
| West Virginia | Marshall County | No air monitoring |
| West Virginia | Mason County | No air monitoring |
| West Virginia | Mercer County | No air monitoring |
| West Virginia | Mineral County | No air monitoring |
| West Virginia | Mingo County | No air monitoring |
| West Virginia | Monongalia County | No air monitoring |
| West Virginia | Monroe County | No air monitoring |
| West Virginia | Morgan County | No air monitoring |
| West Virginia | Nicholas County | No air monitoring |
| West Virginia | Ohio County | 60ppb |
| West Virginia | Pendleton County | No air monitoring |
| West Virginia | Pleasants County | No air monitoring |
| West Virginia | Pocahontas County | No air monitoring |
| West Virginia | Preston County | No air monitoring |
| West Virginia | Putnam County | No air monitoring |
| West Virginia | Raleigh County | No air monitoring |
| West Virginia | Randolph County | No air monitoring |
| West Virginia | Ritchie County | No air monitoring |
| West Virginia | Roane County | No air monitoring |
| West Virginia | Summers County | No air monitoring |
| West Virginia | Taylor County | No air monitoring |
| West Virginia | Tucker County | 58ppb |
| West Virginia | Tyler County | No air monitoring |
| West Virginia | Upshur County | No air monitoring |
| West Virginia | Wayne County | No air monitoring |
| West Virginia | Webster County | No air monitoring |
| West Virginia | Wetzel County | No air monitoring |
| West Virginia | Wirt County | No air monitoring |
| West Virginia | Wood County | No air monitoring |
| West Virginia | Wyoming County | No air monitoring |
| Wisconsin | Adams County | No air monitoring |
| Wisconsin | Ashland County | 57ppb |
| Wisconsin | Barron County | No air monitoring |
| Wisconsin | Bayfield County | No air monitoring |
| Wisconsin | Brown County | 64ppb |
| Wisconsin | Buffalo County | No air monitoring |
| Wisconsin | Burnett County | No air monitoring |
| Wisconsin | Calumet County | No air monitoring |
| Wisconsin | Chippewa County | No air monitoring |
| Wisconsin | Clark County | No air monitoring |
| Wisconsin | Columbia County | 66ppb |
| Wisconsin | Crawford County | No air monitoring |
| Wisconsin | Dane County | 65ppb |
| Wisconsin | Dodge County | 66ppb |
| Wisconsin | Door County | 73ppb |
| Wisconsin | Douglas County | No air monitoring |
| Wisconsin | Dunn County | No air monitoring |
| Wisconsin | Eau Claire County | 62ppb |
| Wisconsin | Florence County | No air monitoring |
| Wisconsin | Fond du Lac County | 64ppb |
| Wisconsin | Forest County | 59ppb |
| Wisconsin | Grant County | No air monitoring |
| Wisconsin | Green County | No air monitoring |
| Wisconsin | Green Lake County | No air monitoring |
| Wisconsin | Iowa County | No air monitoring |
| Wisconsin | Iron County | No air monitoring |
| Wisconsin | Jackson County | No air monitoring |
| Wisconsin | Jefferson County | 66ppb |
| Wisconsin | Juneau County | No air monitoring |
| Wisconsin | Kenosha County | 75ppb |
| Wisconsin | Kewaunee County | 67ppb |
| Wisconsin | La Crosse County | 59ppb |
| Wisconsin | Lafayette County | No air monitoring |
| Wisconsin | Langlade County | No air monitoring |
| Wisconsin | Lincoln County | No air monitoring |
| Wisconsin | Manitowoc County | 73ppb |
| Wisconsin | Marathon County | 57ppb |
| Wisconsin | Marinette County | No air monitoring |
| Wisconsin | Marquette County | No air monitoring |
| Wisconsin | Menominee County | No air monitoring |
| Wisconsin | Milwaukee County | 73ppb |
| Wisconsin | Monroe County | No air monitoring |
| Wisconsin | Oconto County | No air monitoring |
| Wisconsin | Oneida County | No air monitoring |
| Wisconsin | Outagamie County | 64ppb |
| Wisconsin | Ozaukee County | 72ppb |
| Wisconsin | Pepin County | No air monitoring |
| Wisconsin | Pierce County | No air monitoring |
| Wisconsin | Polk County | No air monitoring |
| Wisconsin | Portage County | No air monitoring |
| Wisconsin | Price County | No air monitoring |
| Wisconsin | Racine County | 75ppb |
| Wisconsin | Richland County | No air monitoring |
| Wisconsin | Rock County | 67ppb |
| Wisconsin | Rusk County | No air monitoring |
| Wisconsin | St. Croix County | No air monitoring |
| Wisconsin | Sauk County | 63ppb |
| Wisconsin | Sawyer County | No air monitoring |
| Wisconsin | Shawano County | No air monitoring |
| Wisconsin | Sheboygan County | 75ppb |
| Wisconsin | Taylor County | 59ppb |
| Wisconsin | Trempealeau County | No air monitoring |
| Wisconsin | Vernon County | No air monitoring |
| Wisconsin | Vilas County | 58ppb |
| Wisconsin | Walworth County | 71ppb |
| Wisconsin | Washburn County | No air monitoring |
| Wisconsin | Washington County | No air monitoring |
| Wisconsin | Waukesha County | 68ppb |
| Wisconsin | Waupaca County | No air monitoring |
| Wisconsin | Waushara County | No air monitoring |
| Wisconsin | Winnebago County | No air monitoring |
| Wisconsin | Wood County | No air monitoring |
| Wyoming | Albany County | 68ppb |
| Wyoming | Big Horn County | 60ppb |
| Wyoming | Campbell County | 66ppb |
| Wyoming | Carbon County | No air monitoring |
| Wyoming | Converse County | 66ppb |
| Wyoming | Crook County | No air monitoring |
| Wyoming | Fremont County | 67ppb |
| Wyoming | Goshen County | No air monitoring |
| Wyoming | Hot Springs County | No air monitoring |
| Wyoming | Johnson County | 65ppb |
| Wyoming | Laramie County | 65ppb |
| Wyoming | Lincoln County | No air monitoring |
| Wyoming | Natrona County | 65ppb |
| Wyoming | Niobrara County | No air monitoring |
| Wyoming | Park County | No air monitoring |
| Wyoming | Platte County | No air monitoring |
| Wyoming | Sheridan County | No air monitoring |
| Wyoming | Sublette County | 67ppb |
| Wyoming | Sweetwater County | 65ppb |
| Wyoming | Teton County | 62ppb |
| Wyoming | Uinta County | No air monitoring |
| Wyoming | Washakie County | No air monitoring |
| Wyoming | Weston County | 64ppb |
| Puerto Rico | Adjuntas Municipality | No air monitoring |
| Puerto Rico | Aguada Municipality | No air monitoring |
| Puerto Rico | Aguadilla Municipality | No air monitoring |
| Puerto Rico | Aguas Buenas Municipality | No air monitoring |
| Puerto Rico | Aibonito Municipality | No air monitoring |
| Puerto Rico | Añasco Municipality | No air monitoring |
| Puerto Rico | Arecibo Municipality | No air monitoring |
| Puerto Rico | Arroyo Municipality | No air monitoring |
| Puerto Rico | Barceloneta Municipality | No air monitoring |
| Puerto Rico | Barranquitas Municipality | No air monitoring |
| Puerto Rico | Bayamón Municipality | No air monitoring |
| Puerto Rico | Cabo Rojo Municipality | No air monitoring |
| Puerto Rico | Caguas Municipality | No air monitoring |
| Puerto Rico | Camuy Municipality | No air monitoring |
| Puerto Rico | Canóvanas Municipality | No air monitoring |
| Puerto Rico | Carolina Municipality | No air monitoring |
| Puerto Rico | Cataño Municipality | No air monitoring |
| Puerto Rico | Cayey Municipality | No air monitoring |
| Puerto Rico | Ceiba Municipality | No air monitoring |
| Puerto Rico | Ciales Municipality | No air monitoring |
| Puerto Rico | Cidra Municipality | No air monitoring |
| Puerto Rico | Coamo Municipality | No air monitoring |
| Puerto Rico | Comerío Municipality | No air monitoring |
| Puerto Rico | Corozal Municipality | No air monitoring |
| Puerto Rico | Culebra Municipality | No air monitoring |
| Puerto Rico | Dorado Municipality | No air monitoring |
| Puerto Rico | Fajardo Municipality | No air monitoring |
| Puerto Rico | Florida Municipality | No air monitoring |
| Puerto Rico | Guánica Municipality | No air monitoring |
| Puerto Rico | Guayama Municipality | No air monitoring |
| Puerto Rico | Guayanilla Municipality | No air monitoring |
| Puerto Rico | Guaynabo Municipality | No air monitoring |
| Puerto Rico | Gurabo Municipality | No air monitoring |
| Puerto Rico | Hatillo Municipality | No air monitoring |
| Puerto Rico | Hormigueros Municipality | No air monitoring |
| Puerto Rico | Humacao Municipality | No air monitoring |
| Puerto Rico | Isabela Municipality | No air monitoring |
| Puerto Rico | Jayuya Municipality | No air monitoring |
| Puerto Rico | Juana Díaz Municipality | No air monitoring |
| Puerto Rico | Juncos Municipality | No air monitoring |
| Puerto Rico | Lajas Municipality | No air monitoring |
| Puerto Rico | Lares Municipality | No air monitoring |
| Puerto Rico | Las Marías Municipality | No air monitoring |
| Puerto Rico | Las Piedras Municipality | No air monitoring |
| Puerto Rico | Loíza Municipality | No air monitoring |
| Puerto Rico | Luquillo Municipality | No air monitoring |
| Puerto Rico | Manatí Municipality | No air monitoring |
| Puerto Rico | Maricao Municipality | No air monitoring |
| Puerto Rico | Maunabo Municipality | No air monitoring |
| Puerto Rico | Mayagüez Municipality | No air monitoring |
| Puerto Rico | Moca Municipality | No air monitoring |
| Puerto Rico | Morovis Municipality | No air monitoring |
| Puerto Rico | Naguabo Municipality | No air monitoring |
| Puerto Rico | Naranjito Municipality | No air monitoring |
| Puerto Rico | Orocovis Municipality | No air monitoring |
| Puerto Rico | Patillas Municipality | No air monitoring |
| Puerto Rico | Peñuelas Municipality | No air monitoring |
| Puerto Rico | Ponce Municipality | No air monitoring |
| Puerto Rico | Quebradillas Municipality | No air monitoring |
| Puerto Rico | Rincón Municipality | No air monitoring |
| Puerto Rico | Río Grande Municipality | No air monitoring |
| Puerto Rico | Sabana Grande Municipality | No air monitoring |
| Puerto Rico | Salinas Municipality | No air monitoring |
| Puerto Rico | San Germán Municipality | No air monitoring |
| Puerto Rico | San Juan Municipality | No air monitoring |
| Puerto Rico | San Lorenzo Municipality | No air monitoring |
| Puerto Rico | San Sebastián Municipality | No air monitoring |
| Puerto Rico | Santa Isabel Municipality | No air monitoring |
| Puerto Rico | Toa Alta Municipality | No air monitoring |
| Puerto Rico | Toa Baja Municipality | No air monitoring |
| Puerto Rico | Trujillo Alto Municipality | No air monitoring |
| Puerto Rico | Utuado Municipality | No air monitoring |
| Puerto Rico | Vega Alta Municipality | No air monitoring |
| Puerto Rico | Vega Baja Municipality | No air monitoring |
| Puerto Rico | Vieques Municipality | No air monitoring |
| Puerto Rico | Villalba Municipality | No air monitoring |
| Puerto Rico | Yabucoa Municipality | No air monitoring |
| Puerto Rico | Yauco Municipality | No air monitoring |
About the map data
Based on the U.S. Environmental Protection Agency’s “design values” for annual particulate matter pollution (PM2.5) and 8-hour ozone for U.S counties. A “design value” is the official EPA measure of whether a county complies with the primary (health-protective) annual national ambient air quality standard. Design values are derived from air quality monitoring data that comes from air quality monitors operated by governmental agencies, like EPA or states, that sample the air to measure the amount of pollutant in the air. Not all counties in the United States have an official air quality monitor.
Earthjustice’s Washington, D.C., office works at the federal level to prevent air and water pollution, combat climate change, and protect natural areas. We also work with communities in the Mid-Atlantic region and elsewhere to address severe local environmental health problems, including exposures to dangerous air contaminants in toxic hot spots, sewage backups and overflows, chemical disasters, and contamination of drinking water. The D.C. office has been in operation since 1978.