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United StatesThis visualization shows tropospheric column concentrations of nitrogen dioxide across the U.S. as detected by the Ozone Monitoring Instrument on NASA s Aura satellite. Blue and green denote lower concentrations and orange and red areas denote higher concentrations, ranging from 1e+15 to 5e+15 molecules per square centimeter, respectively. || AtlantaSatellite data show that Atlanta has seen a 42 percent decrease in nitrogen dioxide between the 2005-2007 (left) and 2009-2011 (right) periods. || ChicagoSatellite data show that Chicago has seen a 43 percent decrease in nitrogen dioxide between the 2005-2007 (left) and 2009-2011 (right) periods. || DenverSatellite data show that Denver has seen a 22 percent decrease in nitrogen dioxide between the 2005-2007 (left) and 2009-2011 (right) periods. || HoustonSatellite data show that Houston has seen a 24 percent decrease in nitrogen dioxide between the 2005-2007 (left) and 2009-2011 (right) periods. || Los Angeles-San DiegoSatellite data show that the Los Angeles area has seen a 40 percent decrease in nitrogen dioxide between the 2005-2007 (left) and 2009-2011 (right) periods. || New York CitySatellite 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. || PhiladelphiaSatellite data show that Philadelphia has seen a 26 percent decrease in nitrogen dioxide between the 2005-2007 (left) and 2009-2011 (right) periods. || San Francisco Bay AreaThese images show how nitrogen dioxide in the San Francisco Bay area changed between the 2005-2007 (left) and 2009-2011 (right) periods. || TampaThese images show nitrogen dioxide in Tampa, averaged over 2005 (left) and 2011 (right). || Northeast U.S. – 2005 Still for SliderClose up of nitrogen dioxide in the Northeast U.S. averaged over 2005. || Northeast U.S. – 2011 Still for SliderClose up of nitrogen dioxide in the Northeast U.S. averaged over 2011. || Ohio River Valley – 2005 Still for SliderClose up of nitrogen dioxide in the Ohio River Valley averaged over 2005. || Ohio River Valley – 2011 Still for SliderClose up of nitrogen dioxide in the Ohio River Valley averaged over 2011. || This visualization corresponds to a hyperwall show of the material above.