Dioxin/furan isomer
| Toxic equivalency factor
| 2,3,7,8-tetrachlorinated dibenzo-p-dioxin | 1
| 1,2,3,7,8-pentachlorinated dibenzo-p-dioxin | 1
| 1,2,3,4,7,8-hexachlorinated dibenzo-p-dioxin | 0.1
| 1,2,3,7,8,9-hexachlorinated dibenzo-p-dioxin | 0.1
| 1,2,3,6,7,8-hexachlorinated dibenzo-p-dioxin | 0.1
| 1,2,3,4,6,7,8-heptachlorinated dibenzo-p-dioxin | 0.01
| octachlorinated dibenzo-p-dioxin | 0.0003
| 2,3,7,8-tetrachlorinated dibenzofuran | 0.1
| 2,3,4,7,8-pentachlorinated dibenzofuran | 0.3
| 1,2,3,7,8-pentachlorinated dibenzofuran | 0.03
| 1,2,3,4,7,8-hexachlorinated dibenzofuran | 0.1
| 1,2,3,6,7,8-hexachlorinated dibenzofuran | 0.1
| 1,2,3,7,8,9-hexachlorinated dibenzofuran | 0.1
| 2,3,4,6,7,8-hexachlorinated dibenzofuran | 0.1
| 1,2,3,4,6,7,8-heptachlorinated dibenzofuran | 0.01
| 1,2,3,4,7,8,9-heptachlorinated dibenzofuran | 0.01
| octachlorinated dibenzofuran | 0.0003 |