Detailed ice core measurements show smog-related ratios leveling off in 1970, and suggest these deposits are sensitive to the same chemicals that cause acid rain. By analyzing samples from the Greenland ice sheet, atmospheric scientists found clear evidence of the U.S. Clean Air Act. They also discovered a link between air acidity and how nitrogen is preserved in layers of snow ...
http://www.sciencedaily.com/releases/2014/04/140411091840.ht
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