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…

The Ninth Circuit granted in part and denied in part petitions for review challenging EPA's federal implementation plan to reduce regional haze at two power plants in Montana. The owner and…

The Tenth Circuit denied petitions for review challenging EPA's approval of a regional cap-and-trade program regulating sulfur dioxide (SO2) emissions to address regional haze over the…

The Eighth Circuit vacated and remanded EPA's best available retrofit technology (BART) determination for a large power plant in North Dakota, but otherwise upheld EPA's partial…

The court holds that the best available retrofit technology (BART) provisions of the U.S. Environmental Protection Agency's (EPA's) regional haze rule violate the Clean Air Act (CAA),…