Philadelphia vs Allentown Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, Allentown, PA has cleaner air than Philadelphia, PA — AQI 27 (Good) vs 63 (Moderate), a gap of 36 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. Philadelphia's reading is driven by PM2.5 and Allentown's by O3.
Philadelphia, PA
Moderate
Allentown, PA
Good
Summary
Allentown has 36 points better air quality
Allentown has an AQI of 27 compared to 63
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5-Day Forecast Comparison
| Day | Philadelphia | Allentown | Better |
|---|---|---|---|
| Today | AQI 38 | AQI 27 | Allentown |
| Wed, Sep 23 | AQI 35 | AQI 30 | Allentown |
| Thu, Sep 24 | AQI 37 | AQI 30 | Allentown |