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Polychlorinated biphenyls (PCBs), polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) (see Figure 1) are emitted into the atmosphere from the combustion of chlorine-containing materials.-Additionally, PCBs, which were used as lubricants and dielectric fluids, are volatilized into the atmosphere from soils and bodies of water (for example, from the Great Lakes) after their disposal or inadvertent release into, and cycling through, the environment.-Atmospheric concentrations of PCBs, PCDDs and PCDFs have been measured at numerous locations,and these organochlorine

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