Mealey's (July 19, 2017, 12:08 PM EDT) -- WASHINGTON, D.C. — The District of Columbia U.S. Circuit Court of Appeals on July 18 ordered the U.S. Environmental Protection Agency to explain to two environmental groups why the agency relied on surrogates to determine maximum achievable control technology (MACT) standards for emissions of three hazardous air pollutants when implementing a final rule entered in June 2015, after denying the agency’s motion to dismiss the groups’ petition as untimely (Sierra Club, et al. v. U.S. Environmental Protection Agency, No. 15-1246, D.C. Cir., 2017 U.S. App. LEXIS 12842)....