“Dioxins”
Polyhalogenated Dibenzo-p-dioxins and furans
Never produced intentionally
Unwanted byproducts of industrial and combustion processes
Polyhalogenated Biphenyls, Naphthalenes, Azo/azoxybenzenes
Major industrial chemicals
Limited number of congeners have dioxin-like properties
Chlorinated, brominated, and mixed chloro-bromo congeners