San Diego vs Stockton Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, Stockton, CA has cleaner air than San Diego, CA — AQI 53 (Moderate) vs 58 (Moderate), a gap of 5 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. San Diego's reading is driven by PM2.5 and Stockton's by PM2.5.
San Diego, CA
Moderate
Stockton, CA
Moderate
Summary
Stockton has 5 points better air quality
Stockton has an AQI of 53 compared to 58
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5-Day Forecast Comparison
| Day | San Diego | Stockton | Better |
|---|---|---|---|
| Today | AQI 55 | AQI 50 | Stockton |