The U.S. banned PCBs nearly four decades ago, but they persist in the environment and have been found in animals and humans since then. Now researchers report in ACS' journal Environmental Science & Technology that concentrations of airborne PCBs inside schools could result in some students inhaling the compounds at higher levels than they would consume through their diets. Exposure through both are lower than set limits, but cumulative amounts, researchers caution, could be concerning.
