Polychlorinated Dibenzo-Para-Dioxins and Dibenzofurans - Environmental Health Criteria 88

Polychlorinated dibenzo—p—dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are two series of tricyclic aromatic compounds with similar chemical and physical properties; they are ubiquitous in the environment. They do not occur naturally, nor are they intentionally produced. There are 75 positional isomers of PCDDs and 135 Isomers of PCDFs.