California Air Resources Board

The California Air Resources Board 2025 Annual Network Plan, covering monitoring operations in 26 Air Districts in California will be available soon for review.

CARB Annual Network Plan

Note that there are 35 air districts in California. Nine air districts that conduct ambient are quality monitoring are developing separate Annual Network Plans covering the ambient monitoring within their jurisdictions. This Annual Network Plan covers the 26 air districts for which the local air agencies are not drafting a separate report.

For additional information on California's monitoring network, visit Monitoring Site Information.