Prevalence of low chlorinated dibenzo-p-dioxin/dibenzofurans in human serum

► All PCDD/F congeners were first measured in human serum samples. ► ∑Cl1-3DFs accounted for more than 95% of ∑Cl1-8DFs. ► 2-MoCDF showed the maximum contribution and had a strong correlation in human serum. ► The combination of 2-MoCDF and OCDD could explain the 95.9% variation in human serum.