Congeners Toxicity equivalency
factor
2,3,7,8-tetrachlorodibenzodioxin 1
1,2,3,7,8-pentachlorodibenzodioxin 1
1,2,3,4,7,8-hexachlorodibenzodioxin 0.1
1,2,3,6,7,8-hexachlorodibenzodioxin 0.1
1,2,3,7,8,9-hexachlorodibenzodioxin 0.1
1,2,3,4,6,7,8-heptachlorodibenzodioxin 0.01
Octachlorodibenzodioxin 0.0001
2,3,7,8-tetrachlorodibenzofuran 0.1
1,2,3,7,8-pentachlorodibenzofuran 0.05
2,3,4,7,8-pentachlorodibenzofuran 0.5
1,2,3,4,7,8-hexachlorodibenzofuran 0.1
1,2,3,6,7,8-hexachlorodibenzofuran 0.1
1,2,3,7,8,9-hexachlorodibenzofuran 0.1
2,3,4,6,7,8-hexachlorodibenzofuran 0.1
1,2,3,4,6,7,8-heptachlorodibenzofuran 0.01
1,2,3,4,7,8,9-heptachlorodibenzofuran 0.01
Octachlorodibenzofuran 0.0001