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![Study: National Park Air Quality Is Similar To Largest US Cities](https://1a-1791.com/video/s8/1/N/w/G/M/NwGMa.OvCc.1-small-Study-National-Park-Air-Qua.jpg)
Study: National Park Air Quality Is Similar To Largest US Cities
6 years ago
5
U.S.
air quality
air pollution
sequoia national park
national park
20 largest metropolitan areas
big cities
pollution
ozone layer
Science Advances
The study sampled 33 national parks and 20 of the largest U.S. metropolitan areas.
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