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 |