Air Quality Data Home Page
This page updated April 15, 2009
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The Air Quality Today page provides near real time air quality data for California. This page provides links to other products including week-at-a-glance statistics and hourly air quality data. Caution: Summaries are based on preliminary data. Preliminary data are subject to change or deletion. |
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Summaries of the latest ozone data for selected California regions. The summaries include the maximum ozone concentrations (ppm) for today, yesterday, and the year so far. Caution: Summaries are based on preliminary data. Preliminary data are subject to change or deletion. |
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See summaries indicating how good or bad the air quality is throughout California for a number of pollutants. For example, you can view the number of days per year that air quality is deemed to be unhealthy, and how this has changed over the years. Toxics data summaries are also available. |
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The California Almanac of Emissions and Air Quality - 2009 Edition is now available Adobe Acrobat format. In addition, all tables from this document are available in both Excel and text formats so users can use these data to create alternate presentations. The CD version of the 2009 California Almanac can be ordered through the Order Form for Air Quality Products or by email to aqdweb@arb.ca.gov. |
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Easy to understand information for commonly asked questions about ambient air quality in California. Learn how air quality varies statewide. Learn how to tell how polluted the air is where you live and work. |
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Here you will find a listing of the air quality monitoring sites in California and what pollutants are monitored at each site. Tables indicate how many years of data are available for each site. Includes maps of the site locations. |
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The ARB designates areas of California for each criteria pollutant based on recent ambient air quality data. The Area Designations provides information regarding the designation areas in California with respect to the State Ambient Air Quality Standards. Areas can be designated as attainment, nonattainement, or unclassified. |
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Access information on the status of the air quality monitoring network for fine particulate matter (PM2.5), i.e., where and how PM2.5 is monitored in California. This link also includes information on planned changes to the monitoring network, as well as a summary table of the monitoring results. |
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The ARB has co-sponsored several special field measurement studies for the purpose of collecting air quality, meteorological, and emission data for data analysis and modeling. Descriptions and data are available for the Central California Air Quality Studies (CCAQS) and the 1997 Southern California Ozone Study (SCOS97-NARSTO). |
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Copies of our Air Quality Data Products can be quickly ordered. For example, you can order a paper copy of the monitoring network plan or the almanac. You can also order Air Quality Data CD/DVDs this way. |
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The Air Quality Data CD/DVDs are available free upon request. These CD/DVDs contain a snapshot of 26 years of California air quality data. These CD/DVDs store the data in many formats (ASCII, DBF, etc.). These CD/DVDs also include annual and daily summaries in table format. |
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The E-Mail Sign Up is for the Air Quality Data List Serve which provides an opportunity to sign up to receive e-mail notification of updates to air quality related data, documents, and products developed by the ARB. |
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Please send questions or comments to: aqdweb@arb.ca.gov |
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Data and Statistics