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Ambient Air Monitoring Network
Learn about the Air District's ambient air monitoring network.
The Air District maintains one of the most comprehensive air quality monitoring networks in the country, consisting of over 30 stations distributed among the nine Bay Area counties.
This network measures concentrations of pollutants for which health-based ambient air quality standards have been set by the U.S. Environmental Protection Agency and the California Air Resources Board. The network also measures concentrations of various pollutants designated as Toxic Air Contaminants by the state of California.
This information is used to determine compliance with state and federal air quality standards, prepare air quality forecasts, develop air quality plans, provide information for permit modeling, prepare environmental impact reports, and track air quality trends.
Pollutants measured by the monitoring network include:
- Ground-level ozone
- Carbon monoxide
- Nitrogen oxides
- Sulfur dioxide/oxides
- Particulate matter
- Hydrogen sulfide
2025 Air Monitoring Network Plan
The Air District released its latest Ambient Air Monitoring Network Plan(14 Mb PDF) on May 21, 2025, for public comment. The plan provides a summary of the ambient air monitoring network in 2024 and proposed network changes through 2026. The proposed changes may be found in the section titled “Proposed Modifications to the Network through 2026.” The Air District is soliciting comments from the public on this plan from May 21, 2025, through June 20, 2025.
Comments can be submitted using the Public Comment Form below or by email to analysis@baaqmd.gov. If your comment submitted via the Public Comment Form or via email includes personally identifiable information, such as name, email address, and location, that information may be released publicly. Comments can be submitted anonymously via the Public Comment Form.
Public Comment Form
Submit a Comment
Comments on the Annual Network Plan can also be submitted by email to analysis@baaqmd.gov
Air Monitoring Network Documents
AMN Annual Plan Comments
Last Updated: 5/21/2025