'Nh 4 increased' presentation slideshows

Based on a 20-year data record (1985-2004) at 159 NADP sites, the U.S. chemical climate

Based on a 20-year data record (1985-2004) at 159 NADP sites, the U.S. chemical climate has changed as follows:. Acid rain in 2005 occurs much less frequently than acid rain in 1995. SO 4 decreased at ~97% (89% significant) of sites. NH 4 increased at ~89% (64% significant) of sites.

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