(July 26, 2023, 12:07 PM EDT) -- WASHINGTON, D.C. — A chemical company and two groups filed a brief in the District of Columbia Circuit U.S. Court of Appeals supporting their request for review of the U.S. Environmental Protection Agency’s final rule for emissions standards for hazardous air pollutants, contending that the agency improperly relied on its Integrated Risk Information System (IRIS) inhalation cancer risk value for ethylene oxide dating to 2016....