Peoria Air Quality in October
Across 2019–2025, Peoria's October air quality had a median AQI of 39 (Good) over 217 monitored days in the Peoria, IL area. 0.0% of October days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 59.0% of days. The cleanest October on record here was 2019 (median AQI 31, 0 days above 100) and the worst was 2022 (median 48, 0 days above 100, peak AQI 75).
- Good: 73.7%
- Moderate: 26.3%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Peoria in October?
Good on a typical day: median AQI 39 across 2019–2025, with 0.0% of October days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓73.7% of October days were Good (AQI 0–50), 26.3% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the October peak was 84.
- ✓Best October: 2019; worst October: 2022.
Frequently asked questions
What is the air quality like in Peoria in October?▾
Across 2019–2025, the median daily AQI in Peoria in October was 39 (Good). 73.7% of days were Good, 26.3% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is October a good time for outdoor exercise in Peoria?▾
A typical October day in Peoria sits in the Good range (median AQI 39), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of October days reached AQI 101+ in 2019–2025.
Which pollutant causes Peoria's October air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 59.0% of October days in Peoria. The highest October AQI recorded in 2019–2025 was 84 (Moderate), in 2022.
Peoria October air quality, year by year
Peoria October air quality by year (Peoria, IL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 31 | 31 | 0 | 46 | O3 |
| 2020 | 31 | 41 | 0 | 67 | PM2.5 |
| 2021 | 31 | 35 | 0 | 65 | PM2.5 |
| 2022worst | 31 | 48 | 0 | 75 | PM2.5 |
| 2023 | 31 | 39 | 0 | 71 | PM2.5 |
| 2024 | 31 | 44 | 0 | 74 | O3 |
| 2025 | 31 | 38 | 0 | 84 | PM2.5 |
What October air means in Peoria
A typical October day in Peoria sits in the Good range (median AQI 39), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of October days reached AQI 101+ in 2019–2025.
October's median AQI of 39 is below Peoria's whole-year median of 45, making it one of the area's cleaner periods. Nationally, the median October AQI across every EPA metro area (102,872 metro-days, 2019–2025) is 38, so Peoria runs in line with the national October norm; 0.0% of its October days topped AQI 100 versus 1.3% nationally (below average).
October is part of Peoria's fall season (September, October, November); the fall 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.