State Standard Area Designations
This page last reviewed April 22, 2013
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
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
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.
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.
- Maps of current State Standard Designations - these maps are taken from the latest Area Designation Staff Report. Staff Reports from previous years can be found at the link in Prior Activities above.