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Air pollution in national parks as bad as some large U.S. cities, may be causing drop in visitors

July 19, 2018 USATODAY - News Top Stories

Doyle Rice, USA TODAY Air pollution in national parks as bad as some large U.S. cities, may be causing drop in visitors

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.