The court affirms a February 2001, district court order requiring the U.S. Environmental Protection Agency (EPA) to make an air quality attainment status determination for the St. Louis, Missouri, area and to publish it in the Federal Register by March 20, 2001, and affirms a subsequent court order ...

The U.S. Court of Appeals for the District of Columbia Circuit denies petitioners' challenge to a U.S. Environmental Protection Agency (EPA) rule requiring drastic reductions in exhaust emissions from diesel trucks and buses beginning in 2007 and requiring the maximum sulfur content of diesel fuel t...

The court vacates the U.S. Environmental Protection Agency's (EPA's) approval of the revised ozone state implementation plans (SIPs) for the Washington, D.C., Metropolitan Area (Washington Metropolitan Area), made up of the District of Columbia, portions of Maryland, and portions of Virginia. The di...

The court holds that the Secretary of the Pennsylvania Department of Transportation and the Secretary of the Pennsylvania Department of Environmental Protection violated the Clean Air Act (CAA) by failing to implement state implementation plan (SIP)-required emission standards for the state's enhanc...

The court grants an environmental group's motion for partial summary judgment against Pennsylvania officials for failing to implement the state-enhanced vehicle inspection and maintenance (I/M) program in 16 counties by November 15, 1999, as required by the Pennsylvania state implementation plan (SI...

The court upholds the U.S. Environmental Protection Agency's (EPA's) redesignation of five parcels of tribal land as a nonfederal Class I area under the Clean Air Act (CAA) prevention of significant deterioration (PSD) program. The court first holds that Arizona's chamber of commerce lacks standing ...

The court holds that trade associations' action for judicial review of a U.S. Environmental Protection Agency (EPA) rule permitting the use of "any credible evidence" to prove or disprove Clean Air Act (CAA) violations is not ripe for review. The heart of the associations' argument is that the credi...

The court holds that under the Clean Air Act (CAA), federal entities cannot remove to federal court state and local government actions to enforce air quality laws. A California air quality management district brought a suit against the United States in state court seeking civil penalties for a U.S. ...

The court remands a municipality's request for litigation costs relating to its successful challenge of a U.S. Environmental Protection Agency (EPA) Clean Air Act (CAA) rule establishing new source performance standards for the combustion of municipal solid waste. The court first holds that the muni...

A district court dismissed the U.S. government's lawsuit against the current and former owners of a coal-fired power plant in Indiana County, Pennsylvania, for alleged CAA violations. The government alleged that the former owners undertook construction projects at the plant without having obtain...