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Area Designations Maps / State and National
This page last reviewed September 13, 2011
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pollutants: ozone (8-hour standards; the 1-hour standard was revoked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.
2011 State Area Designations
Changes were approved by the Board on June 23, 2011. These maps are the most current available and represent air quality based on 2007 to 2009 monitoring data.
- Ozone (area designation map, 1-hour area classification map)
- PM2.5 (area designation map)
- PM10 (area designation map)
- Carbon Monoxide (area designation map)
- Nitrogen Dioxide (area designation map)
- Sulfur Dioxide (area designation map)
- Sulfates (area designation map)
- Lead (area designation map)
- Hydrogen Sulfide (area designation map)
- Visibility Reducing Particles (area designation map)
National Area Designations
The following maps were current as of February 2011. Please refer to the U.S. EPA website to see if any changes have been made since that time. The National 1-Hour Ozone Standard was revoked in June 2005.
- Ozone 8-Hour Standard (area designation map)
- PM10 (area designation map)
- PM2.5 (area designation map)
- Carbon Monoxide (area designation map)
- Nitrogen Dioxide (area designation map)
- Sulfur Dioxide (area designation map)
Other Related Information
- Air Basin and County Map Boundaries
- Definitions State and National Designation Categories
For comments on page, email: Theresa Najita
