Peoria Air Quality in 2023
In 2023, Peoria's air quality (Peoria, IL area) had a median daily AQI of 48 (Good) across 340 monitored days. 22 days (6.5%) reached Unhealthy for Sensitive Groups or worse, 187 were Good, and the year's peak AQI was 151 (Unhealthy). Ground-level ozone set the daily AQI on 174 of those days. The cleanest month of 2023 was December (median AQI 38, 0 days above 100) and the worst was June (median 101, 15 days above 100, peak 143).
- Good: 55.0%
- Moderate: 38.5%
- Unhealthy for Sensitive Groups: 6.2%
- Unhealthy or worse: 0.3%
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How was Peoria's air quality in 2023?
Good on a typical day: median AQI 48, with 22 days above AQI 100 out of 340 monitored — the 7th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2023: 151 (Unhealthy).
- ✓Ground-level ozone was the main pollutant on 174 days.
- ✓Cleanest month: December; worst: June.
Frequently asked questions
What was the average AQI in Peoria in 2023?▾
EPA's Air Quality System puts Peoria's (Peoria, IL) median daily AQI for 2023 at 48, which is Good. 22 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 151.
Which month had the worst air quality in Peoria in 2023?▾
The cleanest month of 2023 was December (median AQI 38, 0 days above 100) and the worst was June (median 101, 15 days above 100, peak 143).
Was 2023 a good or bad year for Peoria's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 7th cleanest by days above AQI 100 — the worst year on record here. 2023's median of 48 is above the area's typical annual median of 45.
Peoria month by month in 2023
Peoria air quality month by month, 2023 (Peoria, IL, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 22 | 52 | 0 | 76 | PM2.5 |
| February | 12 | 47 | 0 | 57 | PM2.5 |
| March | 31 | 39 | 0 | 54 | O3 |
| April | 30 | 49 | 0 | 84 | O3 |
| May | 31 | 66 | 6 | 151 | O3 |
| Juneworst | 30 | 101 | 15 | 143 | O3 |
| July | 31 | 48 | 1 | 109 | O3 |
| August | 31 | 46 | 0 | 71 | O3 |
| September | 30 | 51 | 0 | 77 | PM2.5 |
| October | 31 | 39 | 0 | 71 | PM2.5 |
| November | 30 | 46 | 0 | 69 | PM2.5 |
| Decembercleanest | 31 | 38 | 0 | 58 | PM2.5 |
How 2023 compares
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 7th cleanest by days above AQI 100 — the worst year on record here.
2023's median of 48 is above 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 40 (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.