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Most Americans associate U.S. national parks with pristine environments that represent the very best of nature. In the 1916 law that established the National Park Service, Congress directed the new agency to “conserve the scenery and the natural and historic objects and the wild life therein and to provide for the enjoyment of the same in such manner and by such means as will leave them unimpaired for the enjoyment of future generations.”
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Keiser, David; Lade, Gabriel E.; and Rudik, Ivan, "Ozone pollution in US national parks is nearly the same as in large cities" (2018). Economics Publications. 627.