‘Safe’ Lead Levels Lower IQ in Children, Study Finds. Excerpt:
Blood levels of lead below current federal and international guidelines of 10 micrograms per deciliter produce a surprisingly large drop in IQ of up to 7.4 points, a U.S. team reports in today’s New England Journal of Medicine. Researchers estimate that one in every 50 U.S. children has lead levels above that guideline and that one in every 10 has levels of 5 micrograms/deciliter or above — well within the dangerous range.
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