"TM-17" denotes the "total mass" of the 17 dioxin compounds of interest in any given sample of dioxin. Dioxins almost always occur as a complex mixture of individual compounds. The EPA requires facilities to report the 2002 TRI dioxin data in units of total grams, or grams-TM-17 (g-TM17).

"TM-17" reporting is different from "TEQ" reporting of dioxin quantities. The TEQ method is a toxicity-weighted reporting method whereby the masses of individual dioxin compounds are scaled by Toxic Equivalency Factors (TEFs). Unlike the TM-17 method, the TEQ method offers meaningful information about the total toxicity of a dioxin sample. Dioxins commonly are reported using the TEQ method. The US EPA lists dioxin quantities in grams-TEQ in its Inventory of Sources of Dioxin in the United States. Click here for a complete description of TEQ reporting.

Click here for individual facility data

Click here for press release, Chlorine Chemistry Division of the American Chemistry Council Endorses National Academies of Science Dioxin Review Even as Chlorine Sector Dioxin Releases Plummet