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.        

Topics:  u.s    yellowstone   yosemite   acadia   bad   large   visitors   air pollution   national parks   study   

 

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