The American Petroleum Institute, American Fuel and Petrochemicals Manufacturers, National Association of Manufacturers, and the National Oilseed Processors Association filed suit in the U.S. Court of Appeals for the District of Columbia Circuit September 10 challenging the third step of the Environmental Protection Agency’s tailoring rule. The July 12 rule limits greenhouse gas permitting to the largest industrial sources because state permitting authorities need more time to develop the necessary infrastructure. The agency plans to complete a study of the administrative burdens of the permitting program by April 30, 2015, with the next threshold review coming a year later.