Regulation of greenhouse gases under the Clean Air Act

Parts of this article (those related to two June 2014 Supreme Court decisions) need to be updated. Please help update this article to reflect recent events or newly available information. (November 2014)

The United States Environmental Protection Agency (EPA) began regulating greenhouse gases (GHGs) under the Clean Air Act ("CAA" or "Act") from mobile and stationary sources of air pollution for the first time on January 2, 2011. Standards for mobile sources have been established pursuant to Section 202 of the CAA, and GHGs from stationary sources are currently controlled under the authority of Part C of Title I of the Act. The basis for regulations was upheld in the United States Court of Appeals for the District of Columbia in June 2012.^[1][2]

Various regional climate change initiatives in the United States have been undertaken by state and local governments, in addition to federal Clean Air Act regulations.