The U.S. Supreme Court struck down portions of the Los Angeles port's "Clean Truck Program," which was designed in part to reduce emissions related to port operations, including…

The Fifth Circuit held that the CAA does not preempt a local ordinance that allows taxicabs certified to run on compressed natural gas (CNG) to cut ahead of gasoline-powered taxis in the queue for…

The D.C. Circuit upheld EPA's revised NESHAPs for secondary lead smelting facilities. In 2012, acting pursuant to CAA §§112(d)(6) and 112(f)(2), EPA revised the 1995 emissions standards for…

A district court dismissed a city's lawsuit against California state and local air districts challenging fees it must pay to mitigate wind-blown dust from a dry lake bed that exceed state and…

The Ninth Circuit, in an amended opinion, denied an environmental group's petition challenging EPA's decision to grant two air permits authorizing exploratory drilling operations in the…

The Sixth Circuit held that the CAA does not categorically prevent EPA from challenging preconstruction projections of whether and to what extent emissions will increase following construction.…

A district court held that EPA has no mandatory or nondiscretionary duty to make a determination as to whether lead emissions from general aviation aircraft engines using aviation gasoline…

The Eleventh Circuit vacated EPA's 2011 disapproval of Alabama SIP provisions on opacity, thereby reinstating EPA's 2008 approval of opacity limits. EPA's 2011 disapproval was…

A district court dismissed a nonprofit group's lawsuit seeking to halt EPA studies that expose humans to fine particulate matter. The challenged EPA conduct does not constitute final agency…

The D.C. Circuit vacated EPA's 2012 projection of cellulosic biofuel production under the renewable fuel standard (RFS) program. As part of the RFS program, CAA §211(o)(7)(D)(i) requires EPA…