The court denied Vermont's motion to dismiss automobile manufacturers' claims that the state's greenhouse gas regulations are either preempted by or violate the Clean Air Act and…

The court vacates the U.S. Environmental Protection Agency's equipment replacement provision (ERP) rule, which expanded the routine maintenance, repair, and replacement exclusion from new…

The court reverses the dismissal of an individual's complaint against his employer under the Clean Air Act's (CAA's) whistleblower provision. The U.S. Department of Labor's…

The court affirms a district court's grant of summary judgment to the Tennessee Valley Authority (TVA) on environmental groups' request for civil penalties and on its claim as to…

The court remanded portions of a 2002 U.S. Environmental Protection Agency (EPA) rule interpreting when a major stationary source undertakes a "modification," thereby triggering the…

The court affirmed a lower court's grant of summary judgment in favor of a power company charged with modifying its power plants without first obtaining permits in violation of the Clean Air…

The Ninth Circuit held that the U.S. Environmental Protection Agency (EPA) did not act arbitrarily, capriciously, or contrary to law when it granted Nevada's request to split one of its clean…

The Sixth Circuit upheld EPA's redesignation of Cleveland, Ohio, from nonattainment to attainment for particulate matter under CAA §107(d)(3)(E). An environmental group argued that…

The U.S. Supreme Court held that certain aspects of local fleet rules do not escape preemption under CAA §209(a) simply because they address the purchase of vehicles rather than their…

The court holds that a local transportation control measure, adopted as part of California's state implementation plan to attain federal air quality standards in the San Francisco Bay Area,…