Air Toxics Screening Assessment (US EPA)
EPA’s screening tool to provide communities with information about source locations and health risks from air toxics.
California Office of Environmental Health Hazard Assessment (OEHHA) Air
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.
National Ambient Air Quality Standards (NAAQS) for criteria air pollutants (US EPA)
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.
National Ambient Air Quality Standards (NAAQS) Tables (US EPA)
Table of the NAAQS values, associated averaging times, and form of the standard.
California Ambient Air Quality Standards (CAAQS)
California-specific air quality standards for the criteria air pollutants and other regulated pollution.
History of California’s Ambient Air Quality Standards (CARB)
Chronology of California State agencies’ actions around regulating ambient air quality.
Criteria Pollutants (US EPA)
Particulate Matter (PM) Basics (US EPA)
Brief history of air quality in the US and the EPA’s role in monitoring and regulating it.
Ground-level Ozone Basics (US EPA)
Ozone in the air we breathe can harm our health, especially on hot sunny days when ozone can reach unhealthy levels.
Hazardous air pollutants (US EPA)
Information about the 187 hazardous air pollutants (HAPs), also known as air toxics.