Peoria Air Quality in Spring
Across 2019–2025, Peoria's spring (March–May) air quality had a median AQI of 44 (Good) over 644 monitored days in the Peoria, IL area. 1.0% of spring days (6 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 65.7% of days. The cleanest spring on record here was 2020 (median AQI 42, 0 days above 100) and the worst was 2023 (median 48, 6 days above 100, peak AQI 151).
- Good: 69.1%
- Moderate: 30.0%
- Unhealthy for Sensitive Groups: 0.8%
- Unhealthy or worse: 0.2%
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 spring?
Good on a typical day: median AQI 44 across 2019–2025, with 1.0% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓69.1% of spring days were Good (AQI 0–50), 30.0% Moderate (51–100).
- ✓6 days of 644 reached AQI 101+; the spring peak was 151.
- ✓Cleanest month: March; worst month: May.
Frequently asked questions
What is the air quality like in Peoria in spring?▾
Across 2019–2025, the median daily AQI in Peoria in spring was 44 (Good). 69.1% of days were Good, 30.0% Moderate, and 1.0% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Peoria?▾
A typical spring day in Peoria sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of spring days (1.0%) reached AQI 101+ in 2019–2025.
Which pollutant causes Peoria's spring air quality problems?▾
Ground-level ozone set the daily AQI on 65.7% of spring days in Peoria. The highest spring AQI recorded in 2019–2025 was 151 (Unhealthy), in 2023.
Peoria spring air quality, year by year
Peoria spring air quality by year (Peoria, IL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 44 | 0 | 69 | O3 |
| 2020cleanest | 92 | 42 | 0 | 65 | O3 |
| 2021 | 92 | 48 | 0 | 87 | PM2.5 |
| 2022 | 92 | 45 | 0 | 82 | PM2.5 |
| 2023worst | 92 | 48 | 6 | 151 | O3 |
| 2024 | 92 | 44 | 0 | 77 | O3 |
| 2025 | 92 | 44 | 0 | 85 | O3 |
What spring air means in Peoria
A typical spring day in Peoria sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of spring days (1.0%) reached AQI 101+ in 2019–2025.
Spring's median AQI of 44 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 Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Peoria runs in line with the national Spring norm; 1.0% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, March is the cleanest month (median AQI 42, 0.0% of days above 100) and May the worst (median 46, 2.8% 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.