Area Designations Maps / State and National

This page last reviewed June 27, 2014


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(U.S. EPA) makes national area designations for six criteria pollutants: ozone (8-hour standards; the 1-hour standard was revoked effective June 15, 2005), PM10, PM2.5, carbon monoxide, nitrogen dioxide, and sulfur dioxide. Although maps for the national area designations are provided below (designations as of June 2013), please refer to the U.S. EPA website for the most current information on the national area designations.

2013 State Area Designations

The following maps are current as of June 2013 and are included in Appendix C of the 2013 State Area Designations ISOR (Initial Statement of Reasons).  Changes from previous maps were approved by the Executive Officer on February 25, 2014 and will become effective on July 1, 2014. These maps are the most current available and represent air quality based on the most recent monitoring data.


National Area Designations

The following maps are current as of June 2013 and are included in Appendix C the 2013 State Area Designations ISOR (Initial Statement of Reasons); the ozone map is from the 2013 State Area Designations FSOR (Final Statement of Reasons). Please refer to the U.S. EPA website for the most current information on area designations for ozone and other pollutants

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