1-Bromopropane Reference Exposure Levels (RELs) Document - Scientific Review Panel on Toxic Air Contaminants (SRP) Review Draft

Apr 12, 2022

The Office of Environmental Health Hazard Assessment (OEHHA) is releasing a draft document summarizing the toxicity and derivation of Reference Exposure Levels (RELs) for 1-Bromopropane (1-BP). This document will be reviewed and discussed by the Scientific Review Panel on Toxic Air Contaminants (SRP) at its meeting on May 12, 2022 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.

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 RELs for many air pollutants. The 1-BP RELs were developed using the most recent “Air Toxics Hot Spots Program Technical Support Document for the Derivation of Noncancer Reference Exposure Levels,” finalized by OEHHA in 2008.

A draft of the 1-BP REL document was released for a 45-day public review and comment period on January 7, 2022. No public comments were received on the document.

The 1-BP REL values proposed are as follows:

Acute REL (for a 1–hour exposure): 3300 micrograms of 1-BP per cubic meter (μg 1-BP/m3)
Chronic REL (for long–term exposures): 1.7 µg 1-BP/m3
8–Hour REL (for repeated 8–hour exposures): 3.4 µg 1-BP/m3

We are not seeking further comments from the public on the draft document.

Please direct any inquiries concerning technical matters or availability of the documents to:

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

E–mail: John.Budroe@oehha.ca.gov

Telephone: (510) 956-4744

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