二恶英和多氯联苯（ＰＣＢｓ）是无所不在的环境和食品污染物。尽管高剂量的暴露往往是由于某些职业原因或偶发事故，但低剂量的膳食摄入也是一个十分常见的暴露途径。第２８次国际食品添加剂和污染物法典委员会（ＣＣＦＡＣ）将二恶英污染列入正式议题进行讨论。人们认识到食 Dioxins and PCBs are ubiquitous environmental and food contaminants. Although high-dose exposure is often due to certain occupational causes or accidental accidents, low-dose dietary intake is also a very common route of exposure. The 28th International Commission on Food Additives and Contaminants (CCFAC) included dioxin pollution as a formal issue for discussion. People recognize that food