The U.S. Court of Appeals for the District of Columbia Circuit struck down June 12 an Environmental Protection Agency attempt to issue an interim final rule to allow some manufacturers of heavy-duty diesel engines that do not meet emissions requirements to pay penalties and still sell their noncompliant engines, saying that the agency’s reasoning for skipping notice and comment procedures did not hold up to the good cause exemption of the Administrative Procedure Act. Competitors of Navistar sued over the January 2012 decision.