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Advisory
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Air Quality Advisory
A fire has been reported at Valero in Benicia. Air District inspectors are investigating. There is potential for smoke impacts in the immediate area and downwind neighborhoods. Avoid exposure if smoke is impacting your area by remaining indoors with windows and doors closed, if temperatures allow. Follow instructions from local health officials and check back for updates. See current air quality at fire.airnow.gov. Read more...
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Air Quality Measurement
Learn about the Air District’s air quality measurement activities, including the air monitoring network and special studies, laboratory support, data quality assurance, and pollutant source testing.
Ambient Air Monitoring
The Air District conducts ambient air monitoring, both through a fixed-station network and special, short-term studies.
The ambient air monitoring network consists of over 30 stations that collect local air quality data, including measurements of significant air pollutants.
The data from the network and special studies are used for many important purposes, including:
- Determining compliance with state and federal air quality standards.
- Preparing air quality forecasts.
- Clean Air Plan modeling.
- Prevention of Significant Deterioration permit modeling.
- Preparing environmental impact reports.
- Providing information about regional and local air quality and air quality trends.
- Developing air quality rules and regulations.
Special sampling projects, such as fine particulate matter speciation and short-term studies in specific communities, provide data for use in developing air quality plans, updating regulations, and furthering our understanding of air quality in the Bay Area.
Laboratory
The Laboratory provides a variety of monitoring related services and support to Air District departments and activities, including:
- Analyzing samples for potential enforcement action and during and after episodic events (laboratory methods are available in the Manual of Procedures).
- Evaluating, developing, and updating analytical methods.
- Providing technical information for evaluating permits and developing regulatory standards.
- Performing PM2.5 and PM10 gravimetric analysis.
- Performing anion/cation speciation and organic carbon/elemental carbon analysis on PM10 filters.
- Analyzing ambient air for volatile organic compounds and ozone precursor compounds.
Quality Assurance
To ensure the accuracy of data collected through the laboratory, air monitoring and meteorological networks, the Air District validates the data through quality assurance audits. Data generated by the laboratory also require quality assurance review to meet U.S. EPA validation requirements.
Source Testing
The Air District performs source testing to determine whether a pollution source is in compliance with air quality regulations and to provide further information about emission sources. Source test functions include:
- Conducting analytical source tests.
- Conducting performance audits on continuous emissions monitoring and predictive emissions monitoring systems.
- Reviewing and determining suitability of third-party source tests.
- Researching and developing new analytical source test procedures.
- Producing source test data-based engineering studies.
Additional Resources
- List of source tests conducted at Title V and Synthetic Minor Facilities(795 Kb XLSX, posted 10/15/2014)
- Guidance for notification of source testing at a gasoline dispensing facility(22 Kb PDF, 1 pg, revised 2/14/2017)
- Guidance for construction of particulate sampling and testing facilities(421 Kb PDF, 7 pgs, revised 2/14/2017)
- CARB Independent Contractor Program
Contact Us
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415.749.4900
Meteorology & Measurements
Air Monitoring
415.749.4985
Last Updated: 9/27/2016