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Area Designations Maps / State and National
This page last reviewed April 22, 2013
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criteria pollutants: ozone (8-hour standards; the 1-hour standard was
revoked effective June 15, 2005), PM10, carbon monoxide, nitrogen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 May 2012),
please refer to the U.S.
EPA website for the most current information on the national
area designations.
2012 State Area Designations
Changes were approved by the Executive Officer on December 28, 2012 and became effective on April 1, 2013. These maps are the most current available and represent air quality based on 2008 to 2010 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)
(** Per H&SC section 40921.5, classifications are based on data for 1989-1991 and reflect the State 1-hour standard)
National Area Designations
The following maps were current as of February 2011. Please refer to the U.S. EPA website for the most current information on area designations for ozone and other pollutants. The national 1-hour ozone standard was revoked in June 2005.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)
- Lead (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
