@CNN: Air pollution in national parks is nearly the same as in 20 major US cities, a newly published study finds https://t.co/nUV5mtvc29 https://t.co/gAGzSf8HxN

July 18, 2018 / The Arbiter / CNN

@CNN: Air pollution in national parks is nearly the same as in 20 major US cities, a newly published study finds https://t.co/nUV5mtvc29 https://t.co/gAGzSf8HxN

Air pollution in national parks is nearly the same as in 20 major US cities, a newly published study finds https://t.co/nUV5mtvc29 pic.twitter.com/gAGzSf8HxN

— CNN (@CNN) July 18, 2018

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