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The Clean Air Act (CAA) is the U.S. federal law designed to protect people and the environment from air pollution. First enacted in 1970, the CAA was amended in 1977 and 1990 to address the protection of the ozone layer, reducing acid rain and toxic pollutants, and improving air quality and visibility.
The CAA calls for states and EPA to solve multiple air pollution problems through programs based on the latest science and technology. The law authorizes EPA to establish air quality standards to protect public health and public welfare and to regulate emissions of hazardous air pollutants from stationary and mobile sources.