Public Comment Period on the Draft RELs for Ethylene Glycol Mono-N-Butyl Ether and the Draft Inhalation Cancer Unit Risk Factor for Tertiary-Butyl Acetate

The Office of Environmental Health Hazard Assessment (OEHHA) is releasing two documents for public review, one summarizing the toxicity and derivation of Reference Exposure Levels (RELs) for Ethylene Glycol mono-n-Butyl Ether (EGBE) and the other summarizing the carcinogenicity and derivation of an inhalation cancer unit risk factor (URF) for tertiary-Butyl Acetate (TBAc).  RELs are airborne concentrations of a chemical that are not anticipated to result in adverse non–cancer health effects for specified exposure durations in the general population, including sensitive subpopulations.  Inhalation cancer unit risk factors are used to estimate lifetime cancer risks associated with inhalation exposure to a carcinogen.

Please direct your comments on the documents, in writing or by e–mail, and any inquiries concerning technical matters or availability of the documents to:

Dr. John Budroe
Chief, Air Toxicology and Risk Assessment Section
Air, Community, and Environmental Research Branch
Office of Environmental Health Hazard Assessment
1515 Clay Street, 16th Floor
Oakland, CA, 94612

E–mail: John.Budroe@oehha.ca.gov

Telephone: (510) 622-3145

After the close of the public comment period, the documents will be revised as appropriate by OEHHA, and peer reviewed by the State’s Scientific Review Panel on Toxic Air Contaminants. 

Information about dates and agenda for meetings of the Scientific Review Panel can be obtained from the California Air Resources Board website.