DENVER – Visitors appear to be steering clear of some U.S. national parks or cutting visits short because of pollution levels that are comparable to what’s found in major cities, according to a study released Wednesday. Researchers at Iowa State and Cornell universities looked at more than two decades of data on ozone pollution at 33 parks – from Shenandoah to Yellowstone, the Grand Canyon and Yosemite.
Comment on Study links air pollution to drop in national park visitors
MATTHEW BROWN - Associated Press, Portland Press Herald
Wed, 07/18/2018 - 12:53pm
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