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rural areas. A total of 1,132 data for polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDDs/PCDFs) and hexachlorobenzene (HCB), and co-planar polychlorinated biphenyls (co-PCBs) have been measured since 1999 and 2002, respectively. The result was used for this correlation study. A fairly good correlation of R2 = 0.7222 was observed between the TEQ values of PCDDs/PCDFs and co-planar PCBs, but there were poor correlations of R2 = 0.0655 ~ 0.1644 between the residual PCDDs/PCDFs or co-planar PCBs and HCB, either TEQ or total values. Major reasons for little correlations between them can be explained as followings: 1) HCB’ three orders higher detection limit, principally caused by low-resolution work of mass spectrometry, than PCDDs/PCDFs and co-planar PCBs, 2) HCB’s less adsorption onto polyurethane foams (PUFs) due to breakthrough influenced by ambient-air temperature, and 3) area-specific characteristics of unintentionally- produced persistent organic pollutants (UPOPs) due to source-specific emission characteristics. Consequently, analysis of ambient HCB, in which gaseous HCB was sampled with only PUPs and determined by low-resolution work of mass spectrometry, might not be a useful approach to prediction of the levels of PCDDs/PCDFs and co-planar PCB

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