2 decades of air quality gains in western U.S. wiped out by wildfires https://www.tucsonsentinel.com/nationworld/report/120523_western_wildfires/2-decades-air-quality-gains-western-us-wiped-out-by-wildfires/
Progress in air quality made by the United States through legislation like the Clean Air Act have been entirely undone thanks in large measure to two decades of devastating wildfire, which have become more common and more intense.
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