New research suggests that atrazine may be dangerous at lower concentrations than previously thought. Recent studies suggest that, even at concentrations meeting current federal standards, the chemical may be associated with birth defects, low birth weights and menstrual problems.
http://www.nytimes.com/2009/08/23/us/23water.html?_r=1&scp=1&sq=weed%20killer&st=cse
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