New York vs San Diego Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of November 8, 2026, New York, NY has cleaner air than San Diego, CA — AQI 17 (Good) vs 34 (Good), a gap of 17 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 O3.
New York, NY
Good
San Diego, CA
Good
Summary
New York has 17 points better air quality
New York has an AQI of 17 compared to 34
Reduce Indoor Ozone in San Diego
Today's main pollutant in San Diego is ground-level ozone (AQI 34). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Compare activated-carbon purifiers (for gases & ozone):
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5-Day Forecast Comparison
| Day | New York | San Diego | Better |
|---|---|---|---|
| Today | AQI 45 | AQI 54 | New York |
| Sun, Nov 8 | AQI 45 | AQI 61 | New York |