About Dioxin: Its chemical name is 2,3,7,8-tetrachloro-dibenzo-para-dioxin, or TCDD. It is a persistent organic pollutant that contaminated Agent Orange and some of the other color-coded herbicides when the production of one of their components (2,4,5-T) was accelerated during wartime.[ii] TCDD is the most toxic of about 419 types of similar toxic compounds, which include PCBs (polychlorinated bip