Air

OEHHA is responsible for conducting health risk assessments of chemical contaminants found in air, including those identified as toxic air contaminants or on the list of chemicals under the “Hot Spots” Information and Assessment Act. Assessments include development of Cancer Potency Factors to assess the cancer risk from carcinogens in air, and development of Reference Exposure Levels to assess noncancer health impacts. OEHHA has developed and updates risk assessment guidance for use in site-specific risk assessments under the Air Toxics Hot Spots program. OEHHA also makes health-based recommendations to the Air Resources Board for Ambient Air Quality Standards. Recent legislation, the Children's Environmental Health Protection Act, requires OEHHA to explicitly consider infants and children in evaluating health risks of air pollutants. OEHHA is evaluating current risk assessment methods for their adequacy to protect children.

OEHHA also conducts epidemiological investigations of the health effects of criteria air pollutants. Such investigations include the health impacts on sensitive subpopulations such as children and the elderly. For example, OEHHA conducted an evaluation of the impacts of traffic-related pollutants on children. Specifically, the relationship between respiratory health of children and proximity of their schools to heavily-traveled roadways including measured exposure to traffic-related pollutants was analyzed.

OEHHA also evaluates health effects of chemicals commonly found in indoor air. OEHHA participates in a number of inter-Agency activities designed to evaluate indoor air quality health issues and to move California toward safer indoor air quality.

OEHHA provides health-related assistance to the Air Resources Board, air pollution control districts, local health officers and environmental health officers.

Air Toxic Hot Spots

Current Hot Spots risk assessments and guidelines

Criteria Pollutants

Explore health-based recommendations for California's ambient air quality standards

Toxic Air Contaminants

Identification and evaluation to reduce exposure to air toxics

Epidemiological Studies

Examining real-life exposures in human populations, and how they relate to the incidence or prevalence of disease.

OEHHA Air Chemical Database

Get information on chemicals and their typical occurence/uses.

The Leggett Pharmacokinetic Model Code

AIR Leggett+ code download files are only useful for users who have MATLAB software loaded on their computer.

 

Reports, Notices, Documents

Mar 8, 2019: Public Comment Period and Workshops on the Draft Hot Spots Cancer Inhalation Unit Risk Factors for Cobalt and Cobalt Compounds
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.
May 22, 2018: Aliso Canyon Underground Storage Field, Los Angeles County
Evaluation of over four months of Porter Ranch neighborhood air sample data posted for peak levels of benzene, a toxic chemical in natural gas.  Summary of expert input reguarding health measures taken for the Aliso Canyon gas leak.  

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