"Most" of the air samples taken at 40 schools around Chicago were
contaminated with PCB-11, says the Chicago Tribune. Banned over 30
years ago, polychlorinated biphenyls are highly toxic and linked to
diseases like cancer, liver and kidney damage.
Though PCBs are
known to linger in ecosystems, "bio-magnifying" in the fatty tissue of
animals, researchers were surprised to find
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