A district court granted summary judgment in EPA's favor against an engine maker for introducing on-highway engines into commerce without certification, in violation of the CAA. The Act requires that a manufacturer of on-highway engines apply for and obtain a Certificate of Conformity for those engi...

A district court held that an energy company violated the CAA when it undertook major modifications at its power plant without getting the proper permits and installing the best available pollution control technology. The energy company operated a plant that included two grandfathered coal-fired ele...

The Sixth Circuit held that the CAA does not categorically prevent EPA from challenging preconstruction projections of whether and to what extent emissions will increase following new source construction. In March 2013, the appellate court reversed and remanded a district court ruling in favor of an...

The D.C. Circuit granted EPA's request to remand the NESHAPs for industrial, commercial, and institutional boilers to the Agency without vacatur so that it can conduct rulemaking to modify them in accordance with the court's earlier ruling. On July 29, 2016, the court granted in part and denied in p...

A district court dismissed a class action lawsuit against an automobile company for allegedly misleading consumers into purchasing certain diesel vehicles by misrepresenting their environmental impact. The class of consumers alleged that the company's advertisements and public statements represented...

A district court adopted a magistrate judge's recommendations and denied motions to dismiss a lawsuit brought by a group of young people against the U.S. government for failing to protect them from climate change. The plaintiffs alleged that the government has known for decades that carbon dioxide (...