SMMI is part of California Climate Investments, a statewide initiative that puts billions of Cap-and-Invest, formerly known as Cap-and-Trade, dollars to work reducing greenhouse gas emissions, strengthening the economy, and improving public health and the environment — particularly in disadvantaged communities.
Statewide Mobile Monitoring Initiative
The Statewide Mobile Monitoring Initiative (SMMI) is a $27 million legislative investment to generate the first ever block-by-block picture of air quality in over 60 consistently nominated AB 617 communities across California.
More about this program
June 2026 Update
Mobile monitoring for SMMI successfully completed in March 2026, capturing nearly 10 billion air quality measurements across California over nine months. CARB is now conducting a comprehensive, multi‑stage review of this large dataset to ensure the results are accurate, clearly explained, and easy for the public to use.
When the rollout schedule for data products and public visualizations is finalized, CARB will post updates on the SMMI webpage and share notifications through the Community Air email listserv.
Access approved final CAMP documents
Reporting of pollutants exceeding thresholds
Questions & Answers