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Feb 6, 2018, 5:00 am121 ptsGreen Car Congress
Ozone levels across much of North America and Europe dropped significantly between 2000 and 2014. Even so, during 2010-2014, people in parts of California, Arizona, Colorado, Texas, the Midwest and the Middle Atlantic still experienced more than 15 days a year in which ozone levels exceeded the US health-based…
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