Air Toxics Hot Spots
The Air Toxics "Hot Spots" Information and Assessment Act (AB 2588, Connelly) was enacted in 1987, and requires stationary sources of pollutants to report the types and quantities of certain substances routinely released into the air. The goals of the Air Toxics "Hot Spots" Act are to collect emission data, to identify facilities having localized impacts, to ascertain health risks, to notify nearby residents of significant risks, and to reduce those significant risks to acceptable levels.
Guideline Values for Health Risk Assessment
- Hot Spots Unit Risk and Cancer Potency Values
- Acute, 8-hour, and Chronic Reference Exposure Level (RELs)
Current Hot Spots Guidelines Technical Support Documents
Hot Spots Reports, Notices and Documents
May 12, 2021: Public Comment Period and Workshop on the Draft Hot Spots Cancer Inhalation Unit Risk Factor for 1-Bromopropane
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...
Jan 8, 2021: Public Comment Period and Workshops on the Draft Reference Exposure Levels for Chromium (Trivalent) and Inorganic Water-Soluble Trivalent Chromium Compounds
The Office of Environmental Health Hazard Assessment (OEHHA) is releasing a draft document for public review, summarizing the toxicity and derivation of proposed Reference Exposure Levels (RELs) for...
Oct 2, 2020: Notice of Adoption of Cancer Inhalation Unit Risk Factors for Cobalt and Cobalt Compounds
The Office of Environmental Health Hazard Assessment is adopting new cancer inhalation unit risk and slope factors for Cobalt and Cobalt Compounds for use in the Air Toxics Hot Spots Program. ...
Aug 20, 2020: Notice of Adoption of Reference Exposure Levels for Toluene
The Office of Environmental Health Hazard Assessment (OEHHA) is adopting new Reference Exposure Levels (RELs) for Toluene for use in the Air Toxics Hot Spots Program. RELs are airborne concentrations...
Aug 7, 2020: Notice of Adoption of Cancer Inhalation Unit Risk Factor for p-Chloro-α,α,α-Trifluorotoluene
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 implementing this requirement,...
Nov 1, 2019: Extension of the Public Comment Period for the Draft Hot Spots Cancer Inhalation Unit Risk Factor for p Chloro-α,α,α-trifluorotoluene (p-chlorobenzotrifluoride, PCBTF)
OEHHA has received a request from the American Coatings Association to extend the public comment period. This notice extends the comment period to December 17, 2019.
Oct 18, 2019: Public Comment Period and Workshops on the Draft Hot Spots Cancer Inhalation Unit Risk Factors for p Chloro-α,α,α-trifluorotoluene (p-chlorobenzotrifluoride, PCBTF)
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...
Sep 6, 2019: Notice of Adoption of Reference Exposure Levels for Hexamethylene Diisocyanate (Monomer and Polydiisocyanates)
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...
Sep 4, 2019: Cobalt and Cobalt Compounds Cancer Inhalation Unit Risk Factor (IUR) Document - Scientific Review Panel on Toxic Air Contaminants (SRP) Review Draft
IURs are used to estimate lifetime cancer risks associated with inhalation exposure to a carcinogen.
May 31, 2019: Draft Document Summarizing the Toxicity and Derivation of Reference Exposure Levels (RELs) for Toluene
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...