This page is used to search for air monitoring sites matching specified criteria.
Site information comes from the Quality Assurance Section (QAS) database, and includes information on active sites that QAS currently audits.
Site lists can be created by basin, county, district, or site number.

Note: Not all sites or parameters are audited by QAS, and information is subject to change. Please use the link below to notify QAS of any changes or corrections.
basin map county map district map
Browse By Basin Browse By County Browse By District
To get data for a specific site, enter the CARB or AQS site number, or approximate site name.
Leave blank to get the entire sitelist.
Use the 'Site List Generator' link at the bottom of the page for other options.
Enter CARB site number (5 digits):
Enter AQS number (9 digits, no dashes):
Type site name:
Air Monitoring Site List Generator Quality Assurance Main Page Contact QAS