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The article reports on polychiorinated biphenyls in Taiwanese primipara human milk and associated factors. Halogenated aromatic hydrocarbons such as polychiorinated biphenyls (PCBs) are lipophilic, anthropogenic, and toxic chemicals. PCBs had been used in various commercial mixtures, such as transformers, capacitors, non-flammable oils, heat transfer media and paints. These organochlorine compounds persist in the environment and enter the food chain. After consumption, they accumulate in fatty tissues of animals and humans.