The Clean Air Act directs the Environmental Protection Agency to establish national ambient air quality standards (NAAQS)for certain pollutants.These standards are set at three (3)different levels: primary,secondary,and tertiary.

Question

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The Clean Air Act directs the EPA to set NAAQS at two levels: primary standards to protect public health and secondary standards to protect public welfare, not three levels.

The Clean Air Act Directs the Environmental Protection Agency to Establish