Mercury Science Fact Sheet

By | August 2, 2010

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[Illustrations, footnotes and references available in PDF version]

The largest source of annual air-borne Hg is from natural sources such as volcanoes, forest fires, and oceans. Emissions from Yellowstone National Park, for example, likely exceed that of all Wyoming coal-fired power plants combined. Under current estimates of total annual air-borne sources of Hg into the world cycle, US power plant emissions account for as little as 0.5%.