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Andjelkovic et al. J Environ Expo Assess 2024;3:23 https://dx.doi.org/10.20517/jeea.2024.22 Page 13 of 20

Figure 3. Concentration levels of POPs measured in the Belgian pooled national samples from the WHO 2006 and 2014 studies. (A)
chlordane group is expressed as the sum of α-chlordane, β-chlordane and oxychlordane; (B) DDT group as the sum of o,p’-DDT, p,p’-
DDT, p,p’-DDE, and p,p’-DDD; heptachlor group as the sum of heptachlor and heptachlor-epoxide (cis/trans), toxaphene is expressed
as the sum of Parlar 26, Parlar 50, and Parlar 62 and the sum of α-HBCD, β-HBCD, and γ-HBCD [HBCD group: LOQ = 0.8 (yr 2006)
and 0.1 (yr 2014)]; (C) individual PBDE congeners and (D) various sums of PCDD/Fs and PCBs expressed as WHO2005 TEQ. POPs:
Persistent organic pollutants; WHO: World Health Organization; DDT: dichloro-diphenyl-trichloroethane; DDE: dichloro-diphenyl-
dichloroethane; DDD: dichloro-diphenyl-dichloroethylene; HBCD: hexabromocyclododecane; LOQ: limit of quantification; PBDE:
polybrominated diphenyl ether; PCDD: polychlorinated dibenzo-p-dioxin; PCBs: polychlorinated biphenyls; TEQ: total toxic equivalence.