Contact: Kathryn Hansen
NASA/Goddard Space Flight Center
Caption: Satellite data show that New York City has seen a 32 percent decrease in nitrogen dioxide between the 2005-2007 (left) and 2009-2011 (right) periods. The city tops the charts in terms of U.S. population, which usually means more air pollution. Even here, however, the air is on the mend.
Credit: NASA Goddard's Scientific Visualization Studio/T. Schindler
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