What do you think are the reasons that establishing emissions standards was so much easier than establishing air quality standards

Applications and Investigations in Earth Science (9th Edition)
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ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
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Chapter1: The Study Of Minerals
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The original Clean Air Act was intended to establish air quality standards for a large number of pollutants. But there are only six pollutants regulated in this way, because EPA decided not to pursue air quality regulations for other pollutants after an enormous effort to establish standards for these six pollutants.

What do you think are the reasons that establishing emissions standards was so much easier than establishing air quality standards?

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