Coplanar PCB (dioxin-like PCB) Risk
Assessment Document
ABSTRACT
With the purpose of providing the basic scientific
information and data useful for regulators, industries, and
consumers to understand and to make decisions relative to the
possible risks of coplanar polychlorinated biphenyls (Co-PCBs,
dioxin-like PCBs), comprehensive analyses are conducted based
on the existing information and data on Co-PCBs as well as on
other PCBs and dioxins. Further, reviewing the data and
information including sources and amounts of emissions,
environmental concentrations, exposures, pharmacokinetics and
body burdens, etc., human health risks of Co-PCBs (and also of
the total dioxins including Co-PCBs, polychlorinated dibenzo-p-dioxins
(PCDDs), and polychlorinated dibenzofurans (PCDFs)) and
ecological risks of Co-PCBs in Japan are evaluated with their
toxic equivalent (TEQ) values as the toxicity of dioxins
calculated with TEFs.
In the both human health risk and
ecological risk (risk in fish-eating birds) assessments of
Co-PCBs, PCDDs, and PCDFs, it is concluded that the risks at
the current exposure levels are not in the levels to pose any
concern. Compared to the contamination levels in the past,
there is substantial improvement in the current contamination
levels and the risks have been decreased. Only limited effects
are to be achieved with risk reduction measures in the
domestic environment to further decrease human dioxin
exposures, for the significant contributions of the imported
food. It is suggested that the measures with focus to the high
exposure populations, or monitoring and regulations of
imported food would be effective in future.
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