Allentown Air Quality in July
Across 2019–2025, Allentown's July air quality had a median AQI of 54 (Moderate) over 217 monitored days in the Allentown-Bethlehem-Easton, PA-NJ area. 1.4% of July days (3 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 54.8% of days. The cleanest July on record here was 2025 (median AQI 49, 0 days above 100) and the worst was 2021 (median 62, 1 day above 100, peak AQI 154).
- Good: 37.3%
- Moderate: 61.3%
- Unhealthy for Sensitive Groups: 0.9%
- Unhealthy or worse: 0.5%
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 July?
Moderate on a typical day: median AQI 54 across 2019–2025, with 1.4% of July days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓37.3% of July days were Good (AQI 0–50), 61.3% Moderate (51–100).
- ✓3 days of 217 reached AQI 101+; the July peak was 154.
- ✓Best July: 2025; worst July: 2021.
Frequently asked questions
What is the air quality like in Allentown in July?▾
Across 2019–2025, the median daily AQI in Allentown in July was 54 (Moderate). 37.3% of days were Good, 61.3% Moderate, and 1.4% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Allentown?▾
A typical July day in Allentown is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 71 of July days (1.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Allentown's July air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 54.8% of July days in Allentown. The highest July AQI recorded in 2019–2025 was 154 (Unhealthy), in 2021.
Allentown July air quality, year by year
Allentown July 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 | 31 | 55 | 1 | 101 | PM2.5 |
| 2020 | 31 | 51 | 0 | 80 | PM2.5 |
| 2021worst | 31 | 62 | 1 | 154 | PM2.5 |
| 2022 | 31 | 56 | 0 | 84 | PM2.5 |
| 2023 | 31 | 56 | 1 | 111 | PM2.5 |
| 2024 | 31 | 51 | 0 | 93 | O3 |
| 2025cleanest | 31 | 49 | 0 | 88 | O3 |
What July air means in Allentown
A typical July day in Allentown is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 71 of July days (1.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
July's median AQI of 54 is above Allentown's whole-year median of 46, making it one of the area's dirtier periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Allentown runs above the national July norm; 1.4% of its July days topped AQI 100 versus 3.6% nationally (below average).
July is part of Allentown's summer season (June, July, August); the summer 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.