Extension of the Public Comment Period for the Proposed Cancer Inhalation Unit Risk Factors for Cobalt and Cobalt Compounds

The Office of Environmental Health Hazard Assessment (OEHHA) released a draft document, Cobalt and Cobalt Compounds Cancer Inhalation Unit Risk (IUR) Factors, for public review on March 8, 2019, for a 45-day public review period that was originally scheduled to close on April 22, 2019.  OEHHA received a request from ToxStrategies, Inc. to extend the public comment period. This notice extends the comment period to May 7, 2019.

OEHHA is required to develop guidelines for conducting health risk assessments under the Air Toxics Hot Spots Program (Health and Safety Code Section 44360(b)(2)). In response to this statutory requirement, OEHHA develops IURs for many air pollutants. The cobalt and cobalt compounds cancer IUR factors were developed using the most recent “Air Toxics Hot Spots Program Technical Support Document for Cancer Potency Factors,” finalized by OEHHA in 2009.

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 in 2019. 

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

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