Ozone Levels in US National Parks Similar to Levels in Largest US Cities (2 of 3) (IMAGE)

American Association for the Advancement of Science (AAAS)

Ozone Levels in US National Parks Similar to Levels in Largest US Cities (2 of 3)

Caption

Poor visual air quality day at a Grand Canyon national park. This material relates to a paper that appeared in the July 18, 2018, issue of Science Advances, published by AAAS. The paper, by D. Keiser at Iowa State University in Ames, Iowa, and colleagues was titled, "Air pollution and visitation at US national parks."

Credit

[Credit: Alex Hollingsworth]

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