Pittsburgh 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 Pittsburgh, PA — AQI 27 (Good) vs 31 (Good), a gap of 4 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. Pittsburgh's reading is driven by O3 and Allentown's by O3.
Pittsburgh, PA
Good
Allentown, PA
Good
Summary
Allentown has 4 points better air quality
Allentown has an AQI of 27 compared to 31
Reduce Indoor Ozone in Pittsburgh
Today's main pollutant in Pittsburgh is ground-level ozone (AQI 31). 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 | Pittsburgh | Allentown | Better |
|---|---|---|---|
| Today | AQI 31 | AQI 27 | Allentown |
| Wed, Sep 23 | AQI 35 | AQI 30 | Allentown |
| Thu, Sep 24 | AQI 37 | AQI 30 | Allentown |