No solace for Re-Chem from trend in PCBs

Atmospheric concentrations of polychlorinated biphenyls (PCBS) in rural England have declined by a factor of about 50 since the late 1960s, according to a study by scientists from Lancaster University.1 The findings are in direct conflict with claims by the hazardous waste incineration business ReChem International that PCB levels increased across the UK during the late 1980s.

Little monitoring of PCBs in air has been carried out in the UK, and as a result there are few data to show whether the sharp reduction in new uses of the chemicals since the early 1970s has been reflected in air concentrations. However, deposition of PCBs onto the foliar portion of plants is believed to be closely related to their air concentrations, and since PCBs are not taken up by plant roots, indirect evidence of their past air concentra

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