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  • Long-term study shows acid pollution in rain decreases with emissions

    Researchers Christopher Lehmann, left, and David Gay completed a 25-year study of acidic pollutants in rainwater collected across the U.S. and found that both frequency and concentration of acid rainfall has decreased.

    Researchers Christopher Lehmann, left, and David Gay completed a 25-year study of acidic pollutants in rainwater collected across the U.S. and found that both frequency and concentration of acid rainfall has decreased.

    Photo by L. Brian Stauffer

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      Researchers Christopher Lehmann, left, and David Gay completed a 25-year study of acidic pollutants in rainwater collected across the U.S. and found that both frequency and concentration of acid rainfall has decreased.

      Photo by L. Brian Stauffer

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      The mean concentration of sulfuric acid ions in rainwater in 1985 (top) and 2008, as measured by the National Atmospheric Deposition Program's network of collection sites across the United States.

      Credit: National Atmospheric Deposition Program, Illinois State Water Survey

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      Photo by L. Brian Stauffer

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