New York vs San Diego Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, New York, NY has cleaner air than San Diego, CA — AQI 39 (Good) vs 58 (Moderate), a gap of 19 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. New York's reading is driven by PM2.5 and San Diego's by PM2.5.
New York, NY
Good
San Diego, CA
Moderate
Summary
New York has 19 points better air quality
New York has an AQI of 39 compared to 58
Extra Protection for San Diego Homes
Air quality in San Diego is moderate (AQI 58), 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.
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5-Day Forecast Comparison
| Day | New York | San Diego | Better |
|---|---|---|---|
| Today | AQI 30 | AQI 55 | New York |