CNBCのインスタグラム(cnbc) - 7月23日 01時30分

You read that correctly: Air pollution in national parks like Yellowstone, Yosemite and Acadia is as bad as it is in cities like New York City, Los Angeles and Chicago. From 1990 to 2014, average ozone concentrations in national parks were nearly the same as in the 20 largest U.S. metropolitan areas. The parks’ 300 million visitors a year dropped up to 8% when pollution was at its worst, worrying the National Parks Service. For more, check the link in our bio. ⠀
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#CNBC #yellowstonenationalpark #acadianationalpark #yosemitenationalpark #sequoianationalpark #airpollution #airquality #regulations #nationalparks #chicago #newyorkcity #losangeles #cities #tours

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