www.usatoday.com

Jul 21, 2018

Air pollution in national parks equal to some big U.S. cities

and

Air pollution in U.S. national parks such as Yellowstone, Yosemite and Acadia is as bad as some of the nation's largest metropolitan areas, according to a new study. The study also suggests the foul air has caused visitors to cut their visits short or avoid going at all.

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