Ozone levels in many U.S. national parks are similar to those in large cities

Grist
By Nicole JavorskyJul 20, 2018, 12:56 pm379 pts
This story was originally published by CityLab and is reproduced here as part of the Climate Desk collaboration. Even in the awe-inspiring canyons of Yellowstone and mountains of Yosemite, the fresh air may not be so fresh: Concentrations of ozone in many U.S. national parks are similar to levels in America’s…

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