The Tenth Circuit upheld an EPA rule in which it rejected Oklahoma's regional haze plan to limit sulfur dioxide emissions at electric utility power plants and replaced it with its own more…

The Third Circuit upheld an EPA rule imposing sulfur dioxide (S02) limits on a coal-fired power plant in Pennsylvania whose emissions travel directly across a river into areas of New Jersey. The…

The Seventh Circuit held that the statute of limitations bars EPA's and Illinois' CAA suit against a power company for failing to obtain preconstruction permits and to use best available…

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…