WASHINGTON, D.C. - The U.S. Environmental Protection Agency's decision to deny a petition by an environmental group asking the agency to add coal mines to the list of stationary sources that emit air pollution under the Clean Air Act was affirmed by a panel of the U.S. Circuit Court of Appeals for the District of Columbia May 13, after finding that the EPA provided a reasonable explanation (Wildearth Guardians v. U.S. Environmental Protection Agency, et al., No. 13-1212, D.C. Cir.; 2014 U.S. App. LEXIS 8878).