A district court dismissed a county's lawsuit against a railroad company for allowing its locomotive engines to idle in violation of state air pollution law. This case involves railcars, the…

The Seventh Circuit upheld a lower court order enjoining a power company from building a coal-fired power plant without first obtaining a new prevention of significant deterioration (PSD) permit…

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 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 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 Court held that the U.S. Environmental Protection Agency (EPA) has the statutory authority to regulate greenhouse gases (GHGs) from new motor vehicles. The case arose after private…

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…