Response of lake chemistry to atmospheric deposition and climate in selected Class I wilderness areas in the western United States, 1993-2009

http://pubs.usgs.gov/fs/2011/3084/

Sulfate deposition to high-elevation areas has decreased here as a result of reductions in SO2 emissions. Nitrate deposition did not change, whereas ammonium deposition increased, particularly at sites near urban and agricultural areas.

by Mast, M. Alisa

U.S. Geological Survey Fact Sheet 2011-3084

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