The first major US initiative to clean up the nation's air was

Question

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The 1970 Clean Air Act was the first major initiative to clean up the nation's air. It established regulations and standards for various pollutants and required states to meet these standards or face penalties. The act has since been amended several times to address new challenges in air pollution control. The other options (A, B, and D) are not accurate as they either do not exist or are not related to air pollution control in the US.

The First Major US Initiative to Clean Up the Nation's