The Ninth Circuit upheld the dismissal of an environmental group's CAA claim challenging an air quality district's method for offsetting emissions increases in its new source review…

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 holds that the U.S. Environmental Protection Agency (EPA) did not violate the U.S. Constitution's Tenth Amendment or Spending Clause by imposing Clean Air Act (CAA) offset and…

The court upholds a U.S. Environmental Protection Agency (EPA) rule that allows a state to stop Clean Air Act (CAA) §179(a)'s 18-month countdown to imposition of sanctions when it is…

The court holds that New Mexico's environmental agency may not bring an enforcement action in federal court to seek federalpenalties under §113 of the Clean Air Act (CAA) for violations of…