The current study was conducted to screen the PCB residues in blood serum of
mothers residing in five districts of Punjab Province, Pakistan. The mean
concentration of Σ34 PCB congeners was recorded 232.3 ng/g l.w. PCB homologs
profile showed highest levels of Tetra-CBs (53%) followed by Penta-CBs (23%)
and Hexa-CBs(11%), respectively. Spatial distribution of PCB homolog reflected
the higher prevalence of lower chlorinated PCBs in urban population descending
towards rural population. The mean TEQ concentration of eight dioxins like PCBs
was recorded as 0.03 ng/g l.w. Analysis of Σ34PCBs and socio-demographic
parameters reflected significant results for milk intake. The study findings
suggested a need for regulating the continuous intentional or unintentional
releases of PCB into the environment to prevent human exposure.