California Air Resources Board

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Welcome to California, picture montage consisting of California grapes, cable car, pda, San Diego skyline, Hollywood sign, and Monterey cypress tree.
Central California Air Quality Studies
   New - CCAQS Data Access [v2]
   Data Management Policies
   & Procedures
CCAQS (all studies)
CCOS only 
       Documents / Publications
       Requests for Proposals (RFPs)
CRPAQS only 
       Data Analysis
       Documents / Publications
       Monitoring Sites
       Requests for Proposals (RFPs)
Previous Central California Air Quality Studies
       SARMAP ozone study
Other Air Quality Studies
Additional Information
       PM Fact Sheet
       Glossary of Air Pollution Terms

The Central California Air Quality Studies (CCAQS) comprise two studies, the California Regional Particulate Air Quality Study (CRPAQS) and the Central California Ozone Study (CCOS). CCAQS is a multi-year effort of meteorological and air quality monitoring, emission inventory development, data analysis, and air quality simulation modeling.


CRPAQS monitoring occurred during a 14-month study period, between December 1999 and February 2001.

CCOS monitoring took place during the summer of 2000.

These studies utilized 500 instruments at over 100 monitoring locations to measure and analyze for 600 parameters. Additional data was obtained from supplemental data sources. It is anticipated that the database management system will manage 150 million records.

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Please send questions and comments regarding the CCAQS site to: CCAQSDataAdmin

To receive air quality modeling related email:
Air Quality Modeling Listserv.

Updated June 6, 2006