The Ninth Circuit held that EPA did not act arbitrarily and capriciously when it disapproved in part Arizona's regional haze SIP and issued a replacement federal implementation plan (FIP) in place of the disapproved SIP elements. First, EPA did not act arbitrarily and capriciously when it disapprove...

A district court dismissed environmental groups' CAA citizen suit against a crude oil transloading facility for constructing and operating the facility without a prevention of significant deterioration (PSD) permit. The groups allege that the facility is required to have a PSD permit because it has ...

The D.C. Circuit dismissed petitions challenging EPA's authorization of California regulations intended to reduce emissions of particulate matter and oxides of nitrogen from in-use nonroad diesel engines, ruling that venue was improper. A trucking company filed a petition for review of EPA's nonroad...

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 CAA's impacts on jobs under §321(a). High-ranking government officials may not be deposed or called to test...

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 EPA asking it to find that ammonia gas pollution endangers the public health and welfare, designate ammonia as ...

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 impermissibly discriminate against out-of-state tractor trailers in violation of the dormant Commerce Clause. The associatio...

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 onto their properties. The owners brought RCRA and CAA claims against the power plant in addition to their s...

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 "whiskey fungus" to grow on their properties. Below, the district court rejected the distillery's argument that the CAA p...

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 industry association and a steel company—challenged the designations, albeit for different reasons. The industry assoc...

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 associations argued that the program was unconstitutional because it discriminates against out-of-state commerce. Bu...