Hartford vs New Haven Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, New Haven, CT has cleaner air than Hartford, CT — AQI 23 (Good) vs 24 (Good), a gap of 1 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. Hartford's reading is driven by O3 and New Haven's by O3.
Hartford, CT
Good
New Haven, CT
Good
Summary
New Haven has 1 points better air quality
New Haven has an AQI of 23 compared to 24
Reduce Indoor Ozone in Hartford
Today's main pollutant in Hartford is ground-level ozone (AQI 24). 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 | Hartford | New Haven | Better |
|---|---|---|---|
| Today | AQI 30 | AQI 30 | Tie |
| Wed, Sep 23 | AQI 29 | AQI 28 | New Haven |