This guideline is produced by the Agency for Toxic Substances and Disease Registry (ATSDR) and has been updated in 2008. This update replaces Appendix B in the Toxicological Profile for Chlorinated Dibenzo-p-dioxins (CDDs) (December, 1998). It does not reflect a change in ATSDR's scientific assessment on dioxin toxicity or a change in the ATSDR Minimal Risk Level (MRL). The update does not change the assessment of risk associated with dioxin soil levels up to 1 ppb, the level used by EPA as a preliminary remediation goal for residential soils.
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