Global warming spells smoggy, ozone autumns in U.S. Southeast as trees try to cope: study

The Japan Times 

GAINESVILLE, FLORIDA – The drier, warmer autumn weather that's becoming more common due to climate change may extend summer smog well into the fall in the Southeastern U.S. in the years ahead, according to a study published on Monday. Research published in the Proceedings of the National Academy of Sciences also suggests a culprit for the smog that many people might not expect: It's the lush woodlands that give much of the South a lovely green canopy. That's because of a natural defense mechanism trees use to protect their leaves from drought conditions. And since climate models predict more hot, dry Octobers in coming decades, we should expect these late-season smog, or ozone, events to happen more often, according to climatologists at the School of Earth and Atmospheric Sciences at the Georgia Institute of Technology. "It's not going to happen every year, but when it happens it will be worse than in the summertime," said Yuhang Wang, who co-authored the study with Yuzhong Zhang.

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