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| {{encyclopedia|moderator=Henrik}}TEF (TCDD equivalency factor, toxic equivalency factor), a relative toxicity factor of a PCDD/F or PCB congener as related to TCDD. TEF values vary from 1 to 0.00001 or 0 (Table 4; see also TEq). The latest re-evaluation of TEF values was that by WHO in 1998, and these TEF values have been used in this booklet as WHO-TEF for PCDD/Fs and PCB-TEF for PCBs. TEq = ΣTEFi*Ci, where Ci is the amount (or concentration) of congener i.
| | #REDIRECT [[Toxic equivalency factor]] |
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| '''Table 4. Toxic equivalency factors for all PCDD/Fs and PCBs that have a TEF>0. Other congeners are not supposed to have dioxin-like effects. IUPAC numbers for PCBs are given in parenthesis.'''
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| {| border="2"
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| |-
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| ! Congener
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| ! WHO-TEF
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| |-
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| | PCDDs
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| |-
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| | 2,3,7,8-TCDD
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| | 1
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| |-
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| | 1,2,3,7,8-PeCDD
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| | 1
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| |-
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| | 1,2,3,4,7,8-HxCDD
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| | 0.1
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| |-
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| | 1,2,3,6,7,8-HxCDD
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| | 0.1
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| |-
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| | 1,2,3,7,8,9-HxCDD
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| | 0.1
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| |-
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| | 1,2,3,4,6,7,8-HpCDD
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| | 0.01
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| |-
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| | OCDD
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| | 0.0001
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| |-
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| | PCDFs
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| |-
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| | 2,3,7,8-TCDF
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| | 0.1
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| |-
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| | 1,2,3,7,8-PeCDF
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| | 0.05
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| |-
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| | 2,3,4,7,8-PeCDF
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| | 0.5
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| |-
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| | 1,2,3,4,7,8-HxCDF
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| | 0.1
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| |-
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| | 1,2,3,6,7,8-HxCDF
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| | 0.1
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| |-
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| | 1,2,3,7,8,9-HxCDF
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| | 0.1
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| |-
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| | 2,3,4,6,7,8-HxCDF
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| | 0.1
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| |-
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| | 1,2,3,4,6,7,8-HpCDF
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| | 0.01
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| |-
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| | 1,2,3,4,7,8,9-HpCDF
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| | 0.01
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| |-
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| | OCDF
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| | 0.0001
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| |-
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| | Non-ortho-PCBs
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| |-
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| | 3,3’,4,4’-TCB (77)
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| | 0.0001
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| |-
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| | 3,4,4’,5-TCB (81)
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| | 0.0001
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| |-
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| | 3,3’,4,4’,5-PeCB (126)
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| | 0.1
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| |-
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| | 3,3’,4,4’,5,5’-HxCB (169)
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| | 0.01
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| |-
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| | Mono-ortho-PCBs
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| |-
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| | 2,3,3’,4,4’-PeCB (105)
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| | 0.0001
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| |-
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| | 2,3,4,4’,5-PeCB (114)
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| | 0.0005
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| |-
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| | 2,3’,4,4’,5-PeCB (118)
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| | 0.0001
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| |-
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| | 2’,3,4,4’,5-PeCB (123)
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| | 0.0001
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| |-
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| | 2,3,3’,4,4’,5-HxCB (156)
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| | 0.0005
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| |-
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| | 2,3,3’,4,4’,5’-HxCB (157)
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| | 0.0005
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| |-
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| | 2,3’,4,4’,5,5’-HxCB (167)
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| | 0.00001
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| |-
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| | 2,3,3’,4,4’,5,5’-HpCB (189)
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| | 0.0001
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| |}
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