A district court held that the Clean Air Act (CAA) does not preempt a local air district rule that requires developers to reduce nitrogen oxide and particulate matter emissions from their projects…

A district court denied motions for summary judgment on states' claims that an electric utility modified one of its coal-fired power plants in violation of the prevention of signnificant…

A district court held that the applicable legal test for the "routine maintenance, repair, and replacement" exclusions found in the Clean Air Act (CAA) should be applied to activities…

The Second Circuit remanded with directions to dismiss claims against the U.S. Environmental Protection Agency (EPA) and a former Agency administrator for misleading plaintiffs into believing that…

The Ninth Circuit upheld an injunction enjoining the California Air Resources Board from enforcing state regulations that limit emissions from the auxiliary diesel engines of ocean-going vessels…

The Tenth Circuit upheld the constitutionality of Colorado's Clean Indoor Air Act. The Act bans smoking in indoor areas, but it expressly exempts from this general prohibition "airport…

The D.C. Circuit granted in part environmental groups' petition for review of a final rule promulgated by the U.S. Environmental Protection Agency (EPA) to regulate "hot spot"…

The Ninth Circuit affirmed a lower court decision that the Clean Air Act (CAA) does not preempt certain provisions of local "fleet rules" requiring operators to meet specified emission…

The Second Circuit upheld the dismissal of rescue, search, and cleanup workers' substantive due process complaint against federal officials for knowingly issuing false statements about air…

The Court reversed the Fourth Circuit's grant of summary judgment in favor of a coal-fired power plant operator charged with violating the Clean Air Act's (CAA's) prevention of…