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NHAES research: New England lakes recovering rapidly from acid rain
Date:6/9/2014

ndack Mountains of New York. The results are presented in "Decadal Trends Reveal Recent Acceleration in the Rate of Recovery from Acidification in the Northeastern U.S." in the journal Environmental Science & Technology.

According to the U.S. EPA, acid rain refers to a mix of wet and dry materials from the atmosphere containing higher-than-normal amounts of nitric and sulfuric acids. The precursors of acid rain formation result from both natural sources, such as volcanoes and decaying vegetation, and man-made sources, primarily emissions of sulfur dioxide and nitrogen oxide resulting from fossil fuel combustion.

In the United States, roughly two-thirds of all sulfur dioxide and a quarter of all nitrogen oxide come from electric power generation that relies on burning fossil fuels, such as coal. Acid rain occurs when these gases react in the atmosphere with water, oxygen, and other chemicals to form various acidic compounds. The result is a mild solution of sulfuric acid and nitric acid. When sulfur dioxide and nitrogen oxides are released from power plants and other sources, prevailing winds blow these compounds across state and national borders, sometimes over hundreds of miles.

Enacted in 1970, the U.S. Clean Air Act was amended in 1990 and implemented in 1994 to regulate emissions, especially from coal-burning power plants. The Clean Air Interstate Rule issued in 2005 by the EPA sought to further reduce sulfur dioxide and nitrogen oxides by 70 percent. Following these policy changes, total emissions of sulfur and nitrogen in the United States decreased by 51 and 43 percent, respectively, between 2000 and 2010, which was twice the rate of decline for both in the 1990s.


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Contact: William McDowell
bill.mcdowell@unh.edu
603-862-2249
University of New Hampshire
Source:Eurekalert

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