Eleven community, scientist, environmental, and environmental justice groups represented by Earthjustice sued the Environmental Protection Agency (EPA) over a weak national emission rule for hundreds of chemical facilities whose pollution is linked to cancer. The Miscellaneous Organic Chemical Manufacturing, or MON rule, regulates toxic emissions for about 200 chemical plants across the country. These plants emit over 7,400 tons a year of dangerous air pollutants, including at least 2,000 pounds of ethylene oxide, an aggressive carcinogen.