The Fourth Circuit granted EPA's petition for a writ of mandamus to preclude an energy company from deposing EPA Administrator Gina McCarthy in a lawsuit seeking to compel EPA to evaluate the…

A district court dismissed environmental groups' CAA citizen suit against EPA for failing to respond to their 2011 petition concerning ammonia gas pollution. In 2011, the groups petitioned…

The D.C. Circuit dismissed a truck association's lawsuit against EPA challenging California's tractor-trailer emission rules. The association argued that the state regulations…

The D.C. Circuit upheld EPA's designation of Yellowstone County, Montana, and Wayne County, Michigan, as "nonattainment" under the sulfur dioxide (SO2) NAAQS. Two petitioners—an…

The Sixth Circuit held that the CAA does not preempt property owners' state common law tort claims against a nearby power plant for allowing ash, dust, and coal combustion by-products to blow…

The Sixth Circuit held that the CAA does not preempt property owners' state common-law tort claims against a whiskey distillery for excess ethanol emissions that allegedly caused "…

The Third Circuit vacated and remanded EPA's approval of Pennsylvania's 2014 regional haze SIP. CAA §169A requires states to evaluate the impact that emissions from certain sources of…

A district court upheld Oregon's clean fuels program, which seeks to reduce lifecycle emissions of greenhouse gases (GHG) from transportation fuels by 10% over a 10-year period. Trade…

The Fifth Circuit reversed an oil company's convictions for violating the CAA and Migratory Bird Treaty Act (MBTA) in connection with its wastewater treatment system at its Corpus Christi…

The Seventh Circuit upheld EPA's approval of revisions to Illinois' SIP, thereby rejecting challenges raised by Indiana. Indiana argued that the relaxation of Illinois' vehicle…