11.   To this day, a fierce debate continues over how hazardous dioxins are.

12.   Where is dioxin?

13.   While the Vietnamese contend that dioxin is to blame for a range of birth defects among children born in high-dioxin areas, US scientists dispute their evidence.

14.   Among the chemicals found was dioxin, produced when plastic and other chemicals are burned in garbage incinerators, Kyodo said.

15.   Cancer-causing dioxin is a byproduct of chlorine-based chemistry.

16.   Chlorinated dioxin is an air pollutant that comes from burning plastic and medical waste with chlorine.

17.   Dioxin is a byproduct of some herbicides and pesticides.

18.   Dioxin is a byproduct of the manufacture of some herbicides and pesticides, and it has been thrust to the center of elections that are one week away.

19.   Dioxin is a carcinogenic byproduct in the manufacture of some herbicides and pesticides.