California Air Resources Board

This page is used to create lists of 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 agency, basin, pollutant, county, or combination thereof. In addition, links are provided to a "Site List Generator by Agency" and a listing of GPS coordinates (or waypoints) for all active sites.

Note: Not all parameters are audited by QAS, and are subject to change. Please use the link below to notify QAS of any changes or corrections.