Regulations last checked for updates: May 17, 2024

Title 40 - Protection of Environment last revised: May 15, 2024
All TitlesTitle 40Chapter IPart 63Subpart LLLAppendix - Table 2 to Subpart LLL of Part 63—1989 Toxic Equivalency Factors (TEFs)
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Appendix - Table 2 to Subpart LLL of Part 63—1989 Toxic Equivalency Factors (TEFs)
Dioxins/Furans TEFs 1989
2,3,7,8-TCDD1
1,2,3,7,8-PeCDD0.5
1,2,3,4,7,8-HxCDD0.1
1,2,3,6,7,8-HxCDD0.1
1,2,3,7,8,9-HxCDD0.1
1,2,3,4,6,7,8-HpCDD0.01
OCDD 0.001
2,3,7,8-TCDF0.1
1,2,3,7,8-PeCDF0.05
2,3,4,7,8-PeCDF0.5
1,2,3,4,7,8-HxCDF0.1
1,2,3,6,7,8-HxCDF0.1
1,2,3,7,8,9-HxCDF0.1
2,3,4,6,7,8-HxCDF0.1
1,2,3,4,6,7,8-HpCDF0.01
1,2,3,4,7,8,9-HpCDF0.01
OCDF 0.001
[83 FR 35136, July 25, 2018]
authority: 42 U.S.C. 7401
source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.
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