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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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  • Editor's note: To contact Chris Lehman, call 217-265-8512; email clehmann@illinois.edu.
    To reach David Gay, call 217-244-0462; email dgay@illinois.edu.
    Data are available in the public domain at the National Atmospheric Deposition Program website.