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 whiskey distillery for excess ethanol emissions that allegedly caused "…

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 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…

The D.C. Circuit, on remand from the U.S. Supreme Court, invalidated EPA's 2014 emissions budgets under the transport rule, also known as the Cross-State Air Pollution Rule, as applied to…

The D.C. Circuit denied petitions challenging an EPA regulation that revised the NESHAP for hexavalent chromium, a carcinogenic compound that gets emitted into the air during the chrome-finishing…

A district court held that it lacks jurisdiction over Oklahoma's lawsuit against EPA challenging its proposed emission standards for coal-fired power plants. The state argues that the…