Contact: Kathryn Hansen
NASA/Goddard Space Flight Center
Caption: Satellite data show that Atlanta has seen a 42 percent decrease in nitrogen dioxide between the 2005-2007 (left) and 2009-2011 (right) periods. Technology improvements, such as the implementation of emission control devices on power plants, mean that residents here are now breathing cleaner air.
Credit: NASA Goddard's Scientific Visualization Studio/T. Schindler
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Related news release: New NASA images highlight US air quality improvement