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Wildfires are making the US smoggy again, reversing progress on cleaner air, study finds
A study finds that wildfires have reversed U.S. progress on reducing smog since 2015, with national ground-level ozone increasing by 4% as fires grow larger. Researchers attribute this trend partly to climate change and limited air pollution monitoring, projecting smog levels could return to 2003 levels in 20 years if wildfire smoke continues to rise.
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