Prior to the 1950s, all air quality laws in the United States had been enacted at the state and local levels of government.

Name: Prior to the 1950s, all air quality laws in the United States had been enacted at the state and local levels of government.
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Prior to the 1950s, all air quality laws in the United States had been enacted at the state and local levels of government. The federal government did not enact comprehensive air pollution control legislation until the Clean Air Act of 1963.

Prior to the 1950s, All Air Quality Laws in the United