State Standard Area Designations

This page last reviewed April 17, 2014


Background

The Health and Safety Code (H&SC) section 39607(e) requires the Air Resources Board (Board) to establish and periodically review area designation criteria. These designation criteria provide the basis for the Board to designate areas of California as attainment, nonattainment, or unclassified for the State standards.The Board made the first area designations for State ambient air quality standards (State standards) in 1989. Since then, the ARB has reviewed the designations each year, making changes as needed. This web site area provides information about the ARB's activities related to the designation of areas in California with respect to the State standards.

In addition, H&SC section 39608 requires the Board to use the designation criteria to designate areas of California and to annually review those area designations. The Board makes area designations for ten pollutants: ozone, suspended particulate matter (PM10 and PM2.5), carbon monoxide, nitrogen dioxide, sulfur dioxide, sulfates, lead, hydrogen sulfide, and visibility reducing particles. Each year, the Board reviews the area designations and updates them as appropriate, based on the three most recent complete and validated calendar years of air quality data.

We have established an e-mail mailing list for Area Designation activities. As announcements, reports and other information are posted to this website, we will send e-mail notifications to everyone on the list. If you wish to receive these notices, you can subscribe to the mailing list by visiting the Area Designations List Serve Web Page and following the instructions there.

Current Activities

There are no current activities.

Prior Activities

On February 25, 2014, the Executive Officer of the California Air Resources Board approved the proposed changes to the State area designations.  These changes were approved by the Office of Administrative Law on April 10, 2014 and becomes effective on July 1, 2014.  Information regarding the 2013 State Area Designations, including a list of resources used in the designation process, can be found on the 2013 State Area Designations webpage.  

Summaries of changes in the State designations since 1989 are available, as well as links to Staff Reports documenting changes for previous years.

Maps and Tables

Maps of the current State area designations are available for downloading. These documents are in Adobe pdf format.




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