The National Atmospheric Deposition Program (NADP) provides fundamental measurements that support informed decisions on environmental issues related to precipitation and atmospheric deposition chemistry, as well as atmospheric mercury and ammonia. NADP data are relevant to scientists, educators, policymakers, and the public. All data are available via the NADP website (http://nadp.isws. illinois.edu). Products available on this site include seasonal and annual averages, time series trend plots, and maps of concentration and deposition.
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