Air quality improved over the last decade: NASA

June 29, 2014 7:52 AM

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The quality of air over much of the eastern United States, including Washington D. C., has improved over the last decade, according to NASA.

The federal agency recently released images showing a notable decline in the concentration of pollutant nitrogen oxide since 2005. Produced as a by-product of coal-burning power plants and automobiles, Nitrogen dioxide is responsible for various diseases of the respiratory system.

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