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The Clean Air Act is the U.S. regulatory structure for establishing air quality standards and controlling air emissions from mobile and stationary sources. Under the Clean Air Act, the U.S. Environmental Protection Agency (EPA) was granted authority to develop and enforce regulations for air pollution known to affect human health. The Clean Air Act was originally passed in 1963 and revised in 1970, 1977, and 1990.

The Air Pollution Control Act of 1955 (Pub. L. 84–159) was the first federal air pollution legislation and focused on providing technical assistance and research on air pollution. In 1963, Congress passed the Clean Air Act (Pub. L. 88–206) and authorized the U.S. Public Health Service to establish national emission standards to minimize air pollution from stationary sources, such as ...

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