• For use in the Air Toxics Hot Spots Program, the Office of Environmental Health Hazard Assessment (OEHHA) is rapidly adopting cancer inhalation unit risk (IUR) and slope indicators for 1-Bromopropane (1-BP).
• According to Health and Safety Code Section 44360(b)(2), the OEHHA must create guidelines for carrying out health risk assessments as part of the Air Toxics Hot Spots Program.
• For many air pollutants to comply with this requirement, OEHHA creates new IURs and updates existing IURs. The most recent guidelines, "Air Toxics Hot Spots Program Technical Support Document for Cancer Potency Factors," finalized by OEHHA in 2009, were used to create the IUR for 1-BP.

The 1-BP values are as follows:

Inhalation Unit Risk Factor             3.7 × 10-6 (µg/m3)-1

Inhalation Slope Factor                   1.3 × 10-2 (mg/kg-day)-1

• On May 12, 2021, a draft of the 1-BP IUR was made available for public comment. During the following 45-day public review period, it was addressed at a virtual public workshop.
• On the document, there were no public comments made. Before being finalized, the document underwent peer review by the State's Scientific Review Panel (SRP) on Airborne Contaminants in October 2021.

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