Allentown Air Quality in 2020
In 2020, Allentown's air quality (Allentown-Bethlehem-Easton, PA-NJ area) had a median daily AQI of 44 (Good) across 366 monitored days. 1 day (0.3%) reached Unhealthy for Sensitive Groups or worse, 234 were Good, and the year's peak AQI was 117 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 236 of those days. The cleanest month of 2020 was September (median AQI 39, 0 days above 100) and the worst was December (median 53, 1 day above 100, peak 117).
- Good: 63.9%
- Moderate: 35.8%
- Unhealthy for Sensitive Groups: 0.3%
- Unhealthy or worse: 0.0%
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How was Allentown's air quality in 2020?
Good on a typical day: median AQI 44, with 1 day above AQI 100 out of 366 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2020: 117 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 236 days.
- ✓Cleanest month: September; worst: December.
Frequently asked questions
What was the average AQI in Allentown in 2020?▾
EPA's Air Quality System puts Allentown's (Allentown-Bethlehem-Easton, PA-NJ) median daily AQI for 2020 at 44, which is Good. 1 day were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 117.
Which month had the worst air quality in Allentown in 2020?▾
The cleanest month of 2020 was September (median AQI 39, 0 days above 100) and the worst was December (median 53, 1 day above 100, peak 117).
Was 2020 a good or bad year for Allentown's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2020's median of 44 is in line with the area's typical annual median of 46.
Allentown month by month in 2020
Allentown air quality month by month, 2020 (Allentown-Bethlehem-Easton, PA-NJ, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 48 | 0 | 94 | PM2.5 |
| February | 29 | 52 | 0 | 71 | PM2.5 |
| March | 31 | 41 | 0 | 59 | PM2.5 |
| April | 30 | 42 | 0 | 58 | O3 |
| May | 31 | 40 | 0 | 58 | O3 |
| June | 30 | 44 | 0 | 93 | O3 |
| July | 31 | 51 | 0 | 80 | PM2.5 |
| August | 31 | 46 | 0 | 84 | PM2.5 |
| Septembercleanest | 30 | 39 | 0 | 67 | PM2.5 |
| October | 31 | 44 | 0 | 58 | PM2.5 |
| November | 30 | 54 | 0 | 99 | PM2.5 |
| Decemberworst | 31 | 53 | 1 | 117 | PM2.5 |
How 2020 compares
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2020's median of 44 is in line with 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 33 (PM2.5). 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.