Regulations last checked for updates: Mar 14, 2025

Title 40 - Protection of Environment last revised: Nov 14, 2025
All TitlesTitle 40Chapter IPart 63Subpart QQQAppendix - Table 3 to Subpart QQQ of Part 63—2010 Toxic Equivalency Factors (TEFs)
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Appendix - Table 3 to Subpart QQQ of Part 63—2010 Toxic Equivalency Factors (TEFs)

Table 3 to Subpart QQQ of Part 63—2010 Toxic Equivalency Factors (TEFs)

Congener TEF
(mammals)
2,3,7,8-Te CDD1
1,2,3,7,8-Pe CDD1
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
OCDD0.0003
2,3,7,8-Te CDF0.1
1,2,3,7,8-Pe CDF0.03
2,3,4,7,8-Pe CDF0.3
1,2,3,4,7,8-HxCDF0.1
1,2,3,6,7,8-HxCDF0.1
2,3,4,6,7,8-HxCDF0.1
1,2,3,7,8,9-HxCDF0.1
1,2,3,4,6,7,8-HpCDF0.01
1,2,3,4,7,8,9-HpCDF0.01
OCDF0.0003
authority: 42 U.S.C. 7401
source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.
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