Allentown Air Quality in November
Across 2019–2025, Allentown's November air quality had a median AQI of 43 (Good) over 210 monitored days in the Allentown-Bethlehem-Easton, PA-NJ area. 0.0% of November days (0 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 77.1% of days. The cleanest November on record here was 2024 (median AQI 34, 0 days above 100) and the worst was 2020 (median 54, 0 days above 100, peak AQI 99).
- Good: 58.6%
- Moderate: 41.4%
- Unhealthy for Sensitive Groups: 0.0%
- 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 is the air in Allentown in November?
Good on a typical day: median AQI 43 across 2019–2025, with 0.0% of November days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓58.6% of November days were Good (AQI 0–50), 41.4% Moderate (51–100).
- ✓0 days of 210 reached AQI 101+; the November peak was 99.
- ✓Best November: 2024; worst November: 2020.
Frequently asked questions
What is the air quality like in Allentown in November?▾
Across 2019–2025, the median daily AQI in Allentown in November was 43 (Good). 58.6% of days were Good, 41.4% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is November a good time for outdoor exercise in Allentown?▾
A typical November day in Allentown sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of November days reached AQI 101+ in 2019–2025.
Which pollutant causes Allentown's November air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 77.1% of November days in Allentown. The highest November AQI recorded in 2019–2025 was 99 (Moderate), in 2020.
Allentown November air quality, year by year
Allentown November air quality by year (Allentown-Bethlehem-Easton, PA-NJ, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 42 | 0 | 76 | PM2.5 |
| 2020worst | 30 | 54 | 0 | 99 | PM2.5 |
| 2021 | 30 | 53 | 0 | 72 | PM2.5 |
| 2022 | 30 | 51 | 0 | 85 | PM2.5 |
| 2023 | 30 | 43 | 0 | 69 | PM2.5 |
| 2024cleanest | 30 | 34 | 0 | 53 | PM2.5 |
| 2025 | 30 | 36 | 0 | 89 | PM2.5 |
What November air means in Allentown
A typical November day in Allentown sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of November days reached AQI 101+ in 2019–2025.
November's median AQI of 43 is in line with Allentown's whole-year median of 46, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median November AQI across every EPA metro area (92,704 metro-days, 2019–2025) is 39, so Allentown runs above the national November norm; 0.0% of its November days topped AQI 100 versus 0.6% nationally (about the same).
November is part of Allentown's fall season (September, October, November); the fall page pools all three months.
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 month 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.