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.
Ozone Levels In Many Us National Parks Are Similar To Those In Large Cities
Dan Spinelli, Mother Jones
Sat, 07/21/2018 - 3:00am
Topics: citylab and desk collaboration iowa state epa s regional haze rule nps acadia great smoky mountains york chicago houston sequoia national park los angeles—the ground-level haze rule april president trump scott pruitt ivan rudik something citylab yellowstone yosemite university epa clean air act caa amendments regional haze los angeles voc rudik large cities ozone levels national parks are similar areas study people average metro fresh concentrations days researchers unhealthy efforts groups exceedance pollution highest created oxides centered appears sensitive early nitrogen federal increased exposure regulation exposed visitors including percent toxic urban emissions
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