NAAQS: Litigation Trends and Stalled Rulemakings

Under the Clean Air Act, EPA regulates six criteria pollutants through the National Ambient Air Quality Standards (“NAAQS”) program. EPA sets primary and secondary NAAQS that states must meet through regulation of stationary and mobile sources. The Clean Air Act requires EPA to review the NAAQS at least every five years and revise the standards as appropriate.... By: Jenner & Block