Peoria Air Quality in Fall
Across 2019–2025, Peoria's fall (September–November) air quality had a median AQI of 42 (Good) over 619 monitored days in the Peoria, IL area. 0.0% of fall days (0 of 619) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 66.9% of days. The cleanest fall on record here was 2019 (median AQI 38, 0 days above 100) and the worst was 2023 (median 47, 0 days above 100, peak AQI 77).
- Good: 65.9%
- Moderate: 34.1%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Improve Indoor Air Quality
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How is the air in Peoria in fall?
Good on a typical day: median AQI 42 across 2019–2025, with 0.0% of fall days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓65.9% of fall days were Good (AQI 0–50), 34.1% Moderate (51–100).
- ✓0 days of 619 reached AQI 101+; the fall peak was 90.
- ✓Cleanest month: October; worst month: November.
Frequently asked questions
What is the air quality like in Peoria in fall?▾
Across 2019–2025, the median daily AQI in Peoria in fall was 42 (Good). 65.9% of days were Good, 34.1% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 619 monitored days in EPA's Air Quality System.
Is fall a good time for outdoor exercise in Peoria?▾
A typical fall day in Peoria sits in the Good range (median AQI 42), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Which pollutant causes Peoria's fall air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 66.9% of fall days in Peoria. The highest fall AQI recorded in 2019–2025 was 90 (Moderate), in 2023.
Peoria fall air quality, year by year
Peoria fall air quality by year (Peoria, IL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 90 | 38 | 0 | 78 | PM2.5 |
| 2020 | 89 | 42 | 0 | 67 | PM2.5 |
| 2021 | 91 | 44 | 0 | 89 | PM2.5 |
| 2022 | 76 | 46 | 0 | 81 | PM2.5 |
| 2023worst | 91 | 47 | 0 | 77 | PM2.5 |
| 2024 | 91 | 40 | 0 | 74 | PM2.5 |
| 2025 | 91 | 46 | 0 | 90 | PM2.5 |
What fall air means in Peoria
A typical fall day in Peoria sits in the Good range (median AQI 42), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Fall's median AQI of 42 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 Fall AQI across every EPA metro area (296,275 metro-days, 2019–2025) is 40, so Peoria runs in line with the national Fall norm; 0.0% of its Fall days topped AQI 100 versus 1.5% nationally (below average).
Within the season, October is the cleanest month (median AQI 39, 0.0% of days above 100) and November the worst (median 46, 0.0% above 100).
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 season 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.