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The '''Clean Air Act Extension of 1970''' (84 Stat. 1676, Public Law 91-604) is a United States federal law that requires the United States Environmental Protection Agency (EPA) to develop and enforce regulations to protect the general public from exposure to air pollution that are known to be hazardous to human health. This law is an amendment to the [[Clean Air Act]] (CAA) originally passed in 1963. It is sometimes called the '''Muskie Act''' because of the central role Maine Senator Edmund Muskie played in drafting the content of the bill. <ref> {{cite web