Allentown Air Quality in 2024
In 2024, Allentown's air quality (Allentown-Bethlehem-Easton, PA-NJ area) had a median daily AQI of 41 (Good) across 366 monitored days. 4 days (1.1%) reached Unhealthy for Sensitive Groups or worse, 250 were Good, and the year's peak AQI was 119 (Unhealthy for Sensitive Groups). Ground-level ozone set the daily AQI on 202 of those days. The cleanest month of 2024 was January (median AQI 32, 0 days above 100) and the worst was June (median 51, 2 days above 100, peak 108).
- Good: 68.3%
- Moderate: 30.6%
- Unhealthy for Sensitive Groups: 1.1%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Allentown
Today's main pollutant in Allentown is ground-level ozone (AQI 44). 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.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How was Allentown's air quality in 2024?
Good on a typical day: median AQI 41, with 4 days above AQI 100 out of 366 monitored — the 4th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 119 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone was the main pollutant on 202 days.
- ✓Cleanest month: January; worst: June.
Frequently asked questions
What was the average AQI in Allentown in 2024?▾
EPA's Air Quality System puts Allentown's (Allentown-Bethlehem-Easton, PA-NJ) median daily AQI for 2024 at 41, which is Good. 4 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 119.
Which month had the worst air quality in Allentown in 2024?▾
The cleanest month of 2024 was January (median AQI 32, 0 days above 100) and the worst was June (median 51, 2 days above 100, peak 108).
Was 2024 a good or bad year for Allentown's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 4th cleanest by days above AQI 100. 2024's median of 41 is below the area's typical annual median of 46.
Allentown month by month in 2024
Allentown air quality month by month, 2024 (Allentown-Bethlehem-Easton, PA-NJ, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januarycleanest | 31 | 32 | 0 | 69 | PM2.5 |
| February | 29 | 44 | 0 | 81 | PM2.5 |
| March | 31 | 36 | 0 | 62 | O3 |
| April | 30 | 44 | 0 | 67 | O3 |
| May | 31 | 41 | 0 | 87 | O3 |
| Juneworst | 30 | 51 | 2 | 108 | O3 |
| July | 31 | 51 | 0 | 93 | O3 |
| August | 31 | 52 | 1 | 119 | O3 |
| September | 30 | 38 | 1 | 101 | O3 |
| October | 31 | 36 | 0 | 64 | O3 |
| November | 30 | 34 | 0 | 53 | PM2.5 |
| December | 31 | 46 | 0 | 76 | PM2.5 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 4th cleanest by days above AQI 100.
2024's median of 41 is below the area's typical annual median of 46.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Allentown
The latest EPA AirNow observation puts Allentown's AQI at 44 (O3). The figures above are multi-year annual statistics, not today's reading.
View current Allentown air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Allentown-Bethlehem-Easton, PA-NJ), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.