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Daniel Wood/NPR

Traffic Is Way Down Because Of Lockdown, But Air Pollution? Not So Much

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Wildfires caused high levels of air pollution in San Francisco in November 2018. Climate change is making wildfires and heat waves more likely, and driving more days of unhealthy air in many U.S. cities. Eric Risberg/AP hide caption

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Eric Risberg/AP

An image provided by NOAA shows the hole in the ozone layer in 2015. NOAA scientists now say emissions of one ozone-depleting chemical appear to be rising, even though the chemical has been banned and reported production has essentially been at zero for years. NOAA via AP hide caption

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NOAA via AP

Nitrogen oxide pollution in India and China is offsetting U.S. gains in cutting emissions, researchers say. This photo from October shows road traffic, along with smoke and smog, in front of the landmark India Gate in New Delhi. Manish Swarup/AP hide caption

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Manish Swarup/AP

Environmental Protection Agency Administrator Gina McCarthy testifies at an oversight hearing of the Senate Environment and Public Works Committee on Capitol Hill in Washington on July 23. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP