EPA Announces Schedule for Dioxin Assessment
Release date: 08/29/2011
Contact Information: Latisha Petteway (News Media Only),
WASHINGTON - The US Environmental Protection Agency (EPA) announced today
that it plans to complete the non-cancer portion of
EPA’s Reanalysis of Key Issues Related to Dioxin Toxicity and Response to NAS
Comments, and post the final non-cancer assessment to the Integrated
Risk Information System (IRIS) by the end of January 2012. After
completing the non-cancer portion, EPA will finalize the cancer portion of the
dioxin reanalysis as quickly as possible.
The decision to split the dioxin assessment into two
portions, one being the cancer assessment and the other being the non-cancer
assessment, follows the release by the Science Advisory Board (SAB) of its final
review report of EPA’s Reanalysis of Key Issues Related to Dioxin Toxicity
and Response to NAS Comments on August 26, 2011. This reanalysis report
responded to the recommendations and comments included in the National Academy
of Sciences' (NAS) 2006 review of EPA's 2003 draft dioxin assessment.
The SAB report indicates that EPA selected the most
appropriate scientific studies to support the non-cancer health assessment and
the oral reference dose derived in the draft assessment. The SAB also commended
EPA for a clear and logical reanalysis document that responded to many of the
recommendations offered previously by the NAS. Specifically, the SAB
acknowledged that the process the agency used to identify, review and evaluate
the scientific literature was both comprehensive and rigorous, and the SAB
report noted that "the criteria for study selection have been clearly
articulated, well justified, and applied in a scientifically sound manner."
Dioxins are toxic chemicals that share a similar chemical
structure and act through a similar mechanism. While dioxin levels in the
environment have been declining since the early seventies, dioxins remain a
concern because they will continue to enter the food chain through releases from
soils and sediments, and they have been the subject of a number of federal and
state regulations and cleanup actions.
More information on dioxin:
More information on IRIS:
More information on the SAB Report:
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