Mercury levels in rainfall are rising in parts of North America

An analysis of long-term trends in the amount of mercury in precipitation in North America found recent increases at many sites, mostly in the center of the continent. At other sites, including those along the East Coast, mercury levels in rainfall have been trending steadily downward over the past 20 years. The findings are consistent with increased emissions of mercury from coal-burning power plants in Asia and decreased emissions in North America.

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