San Francisco vs Stockton Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 24, 2026, San Francisco, CA has cleaner air than Stockton, CA — AQI 52 (Moderate) vs 63 (Moderate), a gap of 11 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. San Francisco's reading is driven by PM2.5 and Stockton's by PM2.5.
San Francisco, CA
Moderate
Stockton, CA
Moderate
Summary
San Francisco has 11 points better air quality
San Francisco has an AQI of 52 compared to 63
Extra Protection for Stockton Homes
Air quality in Stockton is moderate (AQI 63), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Compare top-rated True-HEPA purifiers:
Prices are approximate and subject to change. As an Amazon Associate, we earn from qualifying purchases at no extra cost to you.
5-Day Forecast Comparison
| Day | San Francisco | Stockton | Better |
|---|---|---|---|
| Today | AQI 55 | AQI 53 | Stockton |