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Studies in Switzerland have found that rain is laced with toxic levels of atrazine, alachlor and other commonly used crop sprays. "Drinking water standards are regularly exceeded in rain," says Stephan Muller, a chemist at the Swiss Federal Institute for Environmental Science and Technology in Dbendorf. The chemicals appear to have evaporated from fields and become part of the clouds.
http://www.healthy.net/library/newsletters/Update/swisspesticides.htm