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The clean air act is a federal environmental law in the United States that focuses on airborne pollutants known to present hazards to human health. It requires the Environmental Protection Agency (EPA) to design and enforce regulations that protect individuals from exposure to these hazardous airborne contaminants. Under the current structure of the law, the EPA sets limits on how much of an airborne pollutant can be in the air anywhere in the United States.

The Clean Air Act is actually a long series of federal laws and amendments that span a period of 50 years. The Clean Air Act of 1963 set emissions standards for stationary sources (such as factories and power plants) and encouraged the use of sulfurremoving technology and future research into the ...

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