Peoria Air Quality in August
Across 2019–2025, Peoria's August air quality had a median AQI of 47 (Good) over 217 monitored days in the Peoria, IL area. 1.0% of August days (2 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 57.1% of days. The cleanest August on record here was 2020 (median AQI 45, 0 days above 100) and the worst was 2025 (median 55, 1 day above 100, peak AQI 154).
- Good: 58.1%
- Moderate: 41.0%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.5%
Improve Indoor Air Quality
Even with good outdoor air in Peoria, indoor PM2.5, dust and allergens build up. A True-HEPA purifier keeps a bedroom or office consistently clean.
Recommended: Levoit Core 400S — True HEPA · CADR ~141 CFM · rooms up to 219 sq ft
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Peoria in August?
Good on a typical day: median AQI 47 across 2019–2025, with 1.0% of August days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓58.1% of August days were Good (AQI 0–50), 41.0% Moderate (51–100).
- ✓2 days of 217 reached AQI 101+; the August peak was 154.
- ✓Best August: 2020; worst August: 2025.
Frequently asked questions
What is the air quality like in Peoria in August?▾
Across 2019–2025, the median daily AQI in Peoria in August was 47 (Good). 58.1% of days were Good, 41.0% Moderate, and 1.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is August a good time for outdoor exercise in Peoria?▾
A typical August day in Peoria sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of August days (1.0%) reached AQI 101+ in 2019–2025.
Which pollutant causes Peoria's August air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 57.1% of August days in Peoria. The highest August AQI recorded in 2019–2025 was 154 (Unhealthy), in 2025.
Peoria August air quality, year by year
Peoria August air quality by year (Peoria, IL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 41 | 1 | 101 | O3 |
| 2020cleanest | 31 | 45 | 0 | 61 | O3 |
| 2021 | 31 | 53 | 0 | 86 | PM2.5 |
| 2022 | 31 | 46 | 0 | 58 | PM2.5 |
| 2023 | 31 | 46 | 0 | 71 | O3 |
| 2024 | 31 | 47 | 0 | 63 | PM2.5 |
| 2025worst | 31 | 55 | 1 | 154 | PM2.5 |
What August air means in Peoria
A typical August day in Peoria sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of August days (1.0%) reached AQI 101+ in 2019–2025.
August's median AQI of 47 is in line with Peoria's whole-year median of 45, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median August AQI across every EPA metro area (104,152 metro-days, 2019–2025) is 45, so Peoria runs in line with the national August norm; 1.0% of its August days topped AQI 100 versus 3.5% nationally (below average).
August is part of Peoria's summer season (June, July, August); the summer page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Peoria
The latest EPA AirNow observation puts Peoria's AQI at 42 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Peoria air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Peoria, IL), 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.