The D.C. Circuit upheld EPA's 2012 regional haze rule, which seeks to restore air quality and visibility in certain national parks and wilderness areas to what they would be under natural conditions. The rule requires states to impose best available retrofit technology (BART) on certain stationary p...

The D.C. Circuit granted in part and denied in part petitions concerning EPA's NESHAPs for industrial boilers. The first challenge raised by environmental groups concerned regulations that indirectly control a group of organic pollutants by limiting carbon monoxide emissions as a proxy for the targe...