The D.C. Circuit reversed and vacated a portion of a January 2013 rule in which EPA revised the NESHAPs and new source performance standards for backup generators. Specifically, the court held…

The D.C. Circuit dismissed petitions challenging EPA's and the National Highway Traffic Safety Administration's (NHTSA's) coordinated rules governing the greenhouse gas emissions…

The D.C. Circuit, in light of the U.S. Supreme Court's decision in Utility Air Regulatory Group v. EPA, No. 12-1146, 44 ELR 20132 (2014), amended a prior decision in which it upheld four EPA…

A district court held that coal companies have standing in their CAA lawsuit against EPA for failing to evaluate the potential for job losses stemming from the Agency's CAA regulation and…

The Sixth Circuit denied a cement company's petition to vacate an EPA rule requiring it to add more stringent air pollution controls at one of its portland-cement plants. The Michigan…

The Ninth Circuit denied an environmental group's petition challenging EPA's approval of a revision to California's SIP. The revision provided alternative "not less stringent…

An Arizona court overturned the state's issuance of an air permit for a proposed open-pit copper mine. An environmental group argued that the state's approval of the permit was arbitrary…

The Ninth Circuit upheld the dismissal of a trucking association's federal preemption challenge to a California environmental regulation on diesel trucks. The regulation requires heavy-duty…

A district court dismissed EPA's lawsuit against an Oklahoma utility under the CAA alleging that it failed to properly project whether modifications made to two coal-fired power plants would…

The D.C. Circuit held that EPA's regulations implementing the 2008 NAAQS for ozone exceed the Agency’s authority under the CAA. In 2008, EPA revised and strengthened the standards for ozone…