This web site provides area designation maps of California for all criteria pollutants that are designated for the State and National standards. These maps are updated annually for the State area designations, as required by the Health and Safety Code (H&SC) section 39608. The Board makes State area designations for ten criteria pollutants: ozone, suspended particulate matter (PM10), fine suspended particulate matter (PM2.5), carbon monoxide, nitrogen dioxide, sulfur dioxide, sulfates, lead, hydrogen sulfide, and visibility reducing particles.

In contrast to the State area designations, the U.S. Environmental Protection Agency (U.S. EPA) makes national area designations for five criteria pollutants: ozone (8-hour standards; the 1-hour standard was revoked effective June 15, 2005), PM10, carbon monoxide, nitrogen dioxide, and sulfur dioxide. Although maps for the national area designations are provided below (designations as of September 2006), please refer to the U.S. EPA website for the most current information on the national area designations.

For comments on page, email: tnajita@arb.ca.gov