As summarized in this slide, most POCs under health risk assessment by U.S. ATSDR, U.S. EPA, or WHO are classified as at least a possible human (i.e., G2b) carcinogen. Many of these selected POCs were also found to cause certain adverse effects on the liver, the kidneys, as well as on the reproductive, the immune, the endocrine, and/or the nervous system. In fact, almost all of these chemicals have been considered or classified as a neurotoxin; and some of them are now labeled as environmental endocrine disruptors (Dong, 2004). It should also be pointed out that PCBs were by far the subgroup most frequently linked to children’s health by a considerable amount of epidemiological data.