On July 5, the U.S. District Court for the District of Columbia won’t dismiss a lawsuit seeking to compel the EPA to make an endangerment finding for GHG emissions from aircraft, saying the finding is a “compulsory step” in determining whether the emissions pose a threat to the environment. Judge Henry H. Kennedy Jr. said EPA’s motion to dismiss could not be granted on the grounds that an endangerment finding for aircraft emissions is a “mandatory” step under Section 231 of the Clean Air Act for determining whether those emissions pose a threat. The environmental groups sued EPA in 2010, alleging the agency had failed to respond to petitions asking it to make an endangerment finding for aircraft, marine vessels, and other non-road engine GHG emissions within the 90 days required by the Clean Air Act.