The Ninth Circuit granted citizen groups' petition for review of a final action by EPA approving in part and disapproving in part revisions to California's SIP for meeting CAA air…

The D.C. Circuit granted in part environmental groups' petition for review of a final rule promulgated by the U.S. Environmental Protection Agency (EPA) to regulate "hot spot"…

The court affirms a district court's grant of summary judgment to the Tennessee Valley Authority (TVA) on environmental groups' request for civil penalties and on its claim as to…

The court holds that a local transportation control measure, adopted as part of California's state implementation plan to attain federal air quality standards in the San Francisco Bay Area,…

The court holds that the U.S. Environmental Protection Agency's (EPA's) approval of Georgia's state implementation plan (SIP) mooted environmental groups' claims that Atlanta…

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/…

The court denies a petition for review seeking reversal of the U.S. Environmental Protection Agency (EPA) Administrator's decision not to object to a state agency's determination that…

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 (…

The court denies an environmental group's petition to review the U.S. Environmental Protection Agency's (EPA's) approval of Maryland's revised motor vehicle emissions budget (…

The court vacates the Environmental Protection Agency's (EPA's) approval of a county's Clean Air Act (CAA) new source review (NSR) program because EPA did not adequately assess…