The Menance of PCB Environmentalists were confident that they had ferreted out the nation's major pollutants after they put the finger on substances like DDT, mercury, lead and phosphates. Now an important newcomer has cropped up in the form of polychlorinated biphenyls (PCBs), colorless, odorless, syrupy chemicals that are manufactured in the U.S. under the trade name Aroclor by the Monsanto Co. Until recently, PCBs were used in industry in many ways, for instance as softeners in plastics, paints and rubber, as additives in printing inks and papers. Although they...
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