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The Office of Environmental Health Hazard Assessment (OEHHA) is releasing a document for public review that summarizes the carcinogenicity and derivation of a cancer inhalation unit risk factor (IUR) for p‑Chloro-α,α,α-trifluorotoluene

(p-chlorobenzotrifluoride, PCBTF).

RELs are airborne concentrations of a chemical that are not anticipated to result in adverse noncancer health effects for specified exposure durations in the general population, including sensitive subpopulations.

The Office of Environmental Health Hazard Assessment (OEHHA) is releasing a draft document summarizing the toxicity and derivation of Reference Exposure Levels (RELs) for Toluene.  This document will be reviewed and discussed by the Scientific Review Panel on Toxic Air Contaminants (SRP) at its meeting on June 28, 2019 in Sacramento, CA.  RELs are airborne concentrations of a chemical that are not anticipated to result in adverse noncancer health effects for specified exposure durations in the general population, including sensitive subpopulations.

The Office of Environmental Health Hazard Assessment (OEHHA) is releasing a document for public review that summarizes the carcinogenicity and derivation of cancer inhalation unit risk factors (IURs) for cobalt and cobalt compounds.  Cancer inhalation unit risk factors are used to estimate lifetime cancer risks associated with inhalation exposure to a carcinogen. This notice extends the comment period to May 7, 2019.

Comment Submissions - Public Comment Period and Workshops on the Draft Hot Spots Cancer Inhalation Unit Risk Factors for Cobalt and Cobalt Compounds

Docket Status
Archive

A draft of the HDI REL document was released for a 75-day public review and comment period on December 1, 2017.  One set of comments was received.  Those comments and the OEHHA responses to those comments are also available at this time.

The Office of Environmental Health Hazard Assessment (OEHHA) is releasing a document for public review that summarizes the carcinogenicity and derivation of cancer inhalation unit risk factors (IURs) for cobalt and cobalt compounds.  Cancer inhalation unit risk factors are used to estimate lifetime cancer risks associated with inhalation exposure to a carcinogen.

The Office of Environmental Health Hazard Assessment (OEHHA) is adopting a new cancer inhalation unit risk factor (IUR) for tert-butyl acetate (TBAc).  IURs are used to estimate lifetime cancer risks associated with inhalation exposure to a carcinogen. 

The adopted RELs cover different types of exposure to EGBE in air: infrequent 1-hour exposures, repeated 8-hour exposures, and continuous long-term exposure.