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tsr dnt todd air quality improvements_00001030.jpg

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    NASA: U.S. air quality improving

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NASA: U.S. air quality improving

NASA maps show that over the last decade, levels of the air pollutant nitrogen dioxide has decreased in U.S. cities.

NASA: U.S. air quality improving

NASA maps show that over the last decade, levels of the air pollutant nitrogen dioxide has decreased in U.S. cities.