Peoria Air Quality in 2025
In 2025, Peoria's air quality (Peoria, IL area) had a median daily AQI of 45 (Good) across 357 monitored days. 4 days (1.1%) reached Unhealthy for Sensitive Groups or worse, 214 were Good, and the year's peak AQI was 154 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 235 of those days. The cleanest month of 2025 was January (median AQI 37, 0 days above 100) and the worst was June (median 58, 2 days above 100, peak 122).
- Good: 59.9%
- Moderate: 38.9%
- Unhealthy for Sensitive Groups: 0.6%
- Unhealthy or worse: 0.6%
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How was Peoria's air quality in 2025?
Good on a typical day: median AQI 45, with 4 days above AQI 100 out of 357 monitored — the 6th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 154 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 235 days.
- ✓Cleanest month: January; worst: June.
Frequently asked questions
What was the average AQI in Peoria in 2025?▾
EPA's Air Quality System puts Peoria's (Peoria, IL) median daily AQI for 2025 at 45, which is Good. 4 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 154.
Which month had the worst air quality in Peoria in 2025?▾
The cleanest month of 2025 was January (median AQI 37, 0 days above 100) and the worst was June (median 58, 2 days above 100, peak 122).
Was 2025 a good or bad year for Peoria's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100. 2025's median of 45 is in line with the area's typical annual median of 45.
Peoria month by month in 2025
Peoria air quality month by month, 2025 (Peoria, IL, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januarycleanest | 31 | 37 | 0 | 66 | PM2.5 |
| February | 25 | 41 | 0 | 63 | PM2.5 |
| March | 31 | 41 | 0 | 85 | O3 |
| April | 30 | 45 | 0 | 67 | O3 |
| May | 31 | 44 | 0 | 84 | O3 |
| Juneworst | 30 | 58 | 2 | 122 | PM2.5 |
| July | 31 | 49 | 1 | 154 | PM2.5 |
| August | 31 | 55 | 1 | 154 | PM2.5 |
| September | 30 | 58 | 0 | 90 | O3 |
| October | 31 | 38 | 0 | 84 | PM2.5 |
| November | 30 | 39 | 0 | 77 | PM2.5 |
| December | 26 | 41 | 0 | 85 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100.
2025's median of 45 is in line with the area's typical annual median of 45.
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 annual 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.