Climate change threatens to worsen U.S. ozone pollution

Ozone pollution across the continental United States will become far more difficult to keep in check as temperatures rise, according to new research. The detailed study shows that Americans face the risk of a 70 percent increase in unhealthy summertime ozone levels by 2050. This is because warmer temperatures and other changes in the atmosphere related to a changing climate, including higher atmospheric levels of methane, spur chemical reactions that lead to ozone.

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