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 Eleventh Amendment bars all but two claims brought by citizen groups in federal court against a state official accused of failing to implement, administer, enforce, and maintain a federally approved state coal mining program under the Surface Mining Control and Reclamation A...

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 holds that the U.S. Forest Service policy of leaving game "baiting" regulation in the National Forest System to the states complies with the National Environmental Policy Act (NEPA) and the Endangered Species Act (ESA). The court first holds that the adoption of the new policy is not a maj...

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 holds that the Surface Mining Control and Reclamation Act (SMCRA) §1272(e) prohibits subsidence and underground mining activities that might lead to subsidence in parks and protected areas. The Secretary of the Interior interpreted §1272(e), which prohibits surface coal mining operations...