San Francisco vs Fresno 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 Fresno, CA — AQI 52 (Moderate) vs 81 (Moderate), a gap of 29 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. San Francisco's reading is driven by PM2.5 and Fresno's by PM10.
San Francisco, CA
Moderate
Fresno, CA
Moderate
Summary
San Francisco has 29 points better air quality
San Francisco has an AQI of 52 compared to 81
Extra Protection for Fresno Homes
Air quality in Fresno is moderate (AQI 81), with particle pollution 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.
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5-Day Forecast Comparison
| Day | San Francisco | Fresno | Better |
|---|---|---|---|
| Today | AQI 55 | AQI 80 | San Francisco |