Which legislation was the first nationally standardized rules in the U.S.to identify,monitor,and reduce air contaminants?

Question

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The Clean Air Act of 1970 was the first major environmental law in the United States to include a comprehensive federal framework for regulating air pollution, setting the foundation for nationally standardized rules to identify, monitor, and reduce air contaminants.

Which Legislation Was the First Nationally Standardized Rules in the U.S.to