21.   Dioxin is of particular concern in the Arctic because it is an extremely long-lived pollutant that tends to build up in the fat of animals and people.

22.   Dioxin is one of the chemicals in Agent Orange, the herbicide used by the United States to kill jungle vegetation during the Vietnam War.

23.   Dioxin was a byproduct in the manufacture of herbicides and pesticides that were commonly in use decades ago.

24.   Dioxin is a chemical by-product from the manufacture of herbicides and other industrial processes.

25.   Dioxin is a generic term for a group of compounds known to cause illness in humans and animals, with some more toxic than others.

26.   Dioxin is a toxic waste byproduct of the manufacture of certain herbicides.

27.   Dioxin is the component of Agent Orange linked to many health effects in laboratory animals.

28.   Dioxins are a group of toxic compounds produced through a number of chemical processes, including combustion.

29.   Dioxins are highly toxic chemical compounds that are produced as byproducts in combustion and in certain chemical and industrial processes involving chlorine.

30.   Dioxin also is a generic term for a group of compounds, some of which are more toxic than others.