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Breathe Easy

NASA satellite images released in June show a noticeable change in air quality across the U.S. But it might not be in the direction you think. Americans across the nation are breathing in far less nitrogen dioxide, a common pollutant that can cause respiratory problems and other issues. Images of Atlanta show a 42 percent decrease in nitrogen dioxide between 2005-2007 and 2009-2011. NASA credits recent regulations and technology advances, such as the implementation of emission control devices on power plants, for the reduction. [NASA]