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Data acquired January 1, 2005 - December 31, 2011 720 x 480 PNG
Data acquired January 1, 2005 - December 31, 2011 435 KB Bytes - PDF
Devices that limit NOx emissions from electric power plants have helped clear the air over the United States.
NASA map by Robert Simmon, using data from Duncan et al., 2013. Caption by Adam Voiland.
Published June 27, 2014 Data acquired January 1, 2005 - December 31, 2011