Similar Stories to Ozone Levels In Many Us National Parks Are Similar To Those In Large Cities on Bing News

This story was originally published by CityLab and appears 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 US national parks are similar to levels in America’s largest metropolitan areas, according to a new study in Science Advances by researchers at Iowa State University and Cornell University. Back in 1990, the biggest US metro areas had higher average ozone concentrations and more exceedance days (when the EPA deems ozone levels unhealthy for sensitive groups) than national parks.

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