The Tenth Circuit upheld a lower court decision rejecting the claims of San Juan County and the state of Utah to a public right-of-way, called Salt Creek Road, in Canyonlands National Park. The state and county wish to use their claimed right-of-way to prevent the United States from closing the Salt...

The U.S. Supreme Court reversed and remanded a lower court decision vacating EPA's transport rule, also known as the Cross-State Air Pollution Rule, which sets sulfur dioxide and nitrogen oxides emissions limits for 28 upwind states based on those states' contributions to downwind states' air qualit...

The D.C. Circuit vacated a portion of EPA's 2013 rule regulating air emissions from Portland cement kilns. The court concluded that the emission-related portions of the rule are permissible under the CAA. It also upheld the compliance schedule implementing some of the 2013 rule's emission standards....