Which of the following is required under the Clean Air Act?

Question

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The Clean Air Act requires the EPA to establish national ambient air quality standards, which set limits on the amount of pollutants that can be present in the air. States are then required to meet these national standards through the implementation of their own individual air quality standards and regulations. However, there is no specific requirement for yearly improvement standards, and the National Park Service's role in preserving natural visibility is outlined in a separate regulation, the Clean Air Visibility Rule.

Which of the Following Is Required Under the Clean Air