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U.S. Air Is Getting Cleaner, Satellite Images Show

New images from NASA's Aura satellite show that over the last decade, the amount of the pollutant nitrogen dioxide in the nation's air has decreased significantly. Continue reading →

June 26, 2014
6:30 PM EDT
Satellite data shows a 32 percent decrease in nitrogen dioxide levels over New York City since the mid-2000s. Credit: NASA

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