Clean Air Act (United States)
（重定向自CAAA）
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![Counties in the United States where one or more National Ambient Air Quality Standards are not met, as of October 2015.](/Images/godic/202501/02/US_Counties_Designated_Non-attainment_according_to_EPA_NAAQS0845.jpg")
![President Lyndon B. Johnson signing the 1967 Clean Air Act in the East Room of the White House, November 21, 1967.](/Images/godic/202501/02/Clean_Air_Act_Signing0845.jpg")
![](/Images/godic/202501/02/Carson_Fall_Mt_Kinabalu0845.jpg")
The Clean Air Act is a United States federal law designed to control air pollution on a national level. It is one of the United States' first and most influential modern environmental laws, and one of the most comprehensive air quality laws in the world. As with many other major U.S. federal environmental statutes, it is administered by the U.S. Environmental Protection Agency (EPA), in coordination with state, local, and tribal governments. Its implementing regulations are codified at 40 C.F.R. Subchapter C, Parts 50-97.