Philadelphia vs Harrisburg Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 23, 2026, Harrisburg, PA has cleaner air than Philadelphia, PA — AQI 24 (Good) vs 63 (Moderate), a gap of 39 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. Philadelphia's reading is driven by PM2.5 and Harrisburg's by PM2.5.
Philadelphia, PA
Moderate
Harrisburg, PA
Good
Summary
Harrisburg has 39 points better air quality
Harrisburg has an AQI of 24 compared to 63
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5-Day Forecast Comparison
| Day | Philadelphia | Harrisburg | Better |
|---|---|---|---|
| Today | AQI 38 | AQI 24 | Harrisburg |
| Wed, Sep 23 | AQI 35 | AQI 32 | Harrisburg |
| Thu, Sep 24 | AQI 37 | AQI 34 | Harrisburg |