Environmentalists sue EPA over ozone NAAQS implementation rule

Three environmental groups are suing EPA over the agency’s Nov. 7 final rule for implementation of the Obama EPA’s tightened 2015 federal ozone standard, in a suit that may test the Trump administration’s policy of easing states’ compliance with the standard by granting waivers for ozone of international origin, among other steps. Downwinders At Risk, Sierra Club and the National Parks Conservation Association filed their suit Feb. 4 in the U.S. Court of Appeals for the District of Columbia Circuit,...