Information on OEHHA’s health risk assessments for various chemical contaminants found in the air. Contains links to health-based recommendations, air toxics hot spot information, epidemiological studies, and more.
Scientific and technical information about the current and prior review of the NAAQS for each of the six criteria pollutants: CO, PM, O3, NO2, SO2 and lead.
Table of the NAAQS values, associated averaging times, and form of the standard.
California-specific air quality standards for the criteria air pollutants and other regulated pollution.
Chronology of California State agencies’ actions around regulating ambient air quality.
Brief history of air quality in the US and the EPA’s role in monitoring and regulating it.
Ozone in the air we breathe can harm our health, especially on hot sunny days when ozone can reach unhealthy levels.
Information about the 187 hazardous air pollutants (HAPs), also known as air toxics.
Information about the 30 HAPs of greatest threat to public health in urban areas, also know as urban air toxics.