Regulations last checked for updates: Nov 25, 2024

Title 40 - Protection of Environment last revised: Nov 21, 2024
Appendix - Table 2 to Subpart W of Part 63—Toxic Equivalency Factors
Dioxin and Furan Congener Toxic
equivalency factor
1,2,3,7,8-pentachlorodibenzo-p-dioxin1
1,2,3,4,7,8-hexachlorodibenzo-p-dioxin0.1
1,2,3,7,8,9-hexachlorodibenzo-p-dioxin0.1
1,2,3,6,7,8-hexachlorodibenzo-p-dioxin0.1
1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin0.01
octachlorodibenzo-p-dioxin0.0003
2,3,7,8-tetrachlorodibenzofuran0.1
2,3,4,7,8-pentachlorodibenzofuran0.3
1,2,3,7,8-pentachlorodibenzofuran0.03
1,2,3,4,7,8-hexachlorodibenzofuran0.1
1,2,3,6,7,8-hexachlorodibenzofuran0.1
1,2,3,7,8,9-hexachlorodibenzofuran0.1
2,3,4,6,7,8-hexachlorodibenzofuran0.1
1,2,3,4,6,7,8-heptachlorodibenzofuran0.01
1,2,3,4,7,8,9-heptachlorodibenzofuran0.01
Octachlorodibenzofuran0.0003
[89 FR 43275, May 16, 2024]
authority: 42 U.S.C. 7401
source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.