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in the air, which was lower than the previous standard of 84 ppb set in 1997. The findings essentially suggest that if healthy young adults exercise outside at ozone levels of 70 ppb for several hours -- taking a long hike, for instance -- about half will suffer respiratory symptoms like coughing or pain during deep breathing, explained lead researcher Dr. 4 ppb of the chemical, instead of the prior threshold of 0. |
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