Springfield, IL Air Quality in January
Across 2019–2025, Springfield's January air quality had a median AQI of 39 (Good) over 211 monitored days in the Springfield, IL area. 0.0% of January days (0 of 211) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 100.0% of days. The cleanest January on record here was 2025 (median AQI 27, 0 days above 100) and the worst was 2019 (median 53, 0 days above 100, peak AQI 70).
- Good: 66.8%
- Moderate: 33.2%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Springfield
Today's main pollutant in Springfield is ground-level ozone (AQI 32). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
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How is the air in Springfield in January?
Good on a typical day: median AQI 39 across 2019–2025, with 0.0% of January days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓66.8% of January days were Good (AQI 0–50), 33.2% Moderate (51–100).
- ✓0 days of 211 reached AQI 101+; the January peak was 70.
- ✓Best January: 2025; worst January: 2019.
Frequently asked questions
What is the air quality like in Springfield in January?▾
Across 2019–2025, the median daily AQI in Springfield in January was 39 (Good). 66.8% of days were Good, 33.2% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 211 monitored days in EPA's Air Quality System.
Is January a good time for outdoor exercise in Springfield?▾
A typical January day in Springfield 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 January days reached AQI 101+ in 2019–2025.
Which pollutant causes Springfield's January air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 100.0% of January days in Springfield. The highest January AQI recorded in 2019–2025 was 70 (Moderate), in 2019.
Springfield January air quality, year by year
Springfield January air quality by year (Springfield, IL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019worst | 27 | 53 | 0 | 70 | PM2.5 |
| 2020 | 29 | 43 | 0 | 60 | PM2.5 |
| 2021 | 31 | 41 | 0 | 62 | PM2.5 |
| 2022 | 31 | 44 | 0 | 67 | PM2.5 |
| 2023 | 31 | 46 | 0 | 68 | PM2.5 |
| 2024 | 31 | 34 | 0 | 59 | PM2.5 |
| 2025cleanest | 31 | 27 | 0 | 60 | PM2.5 |
What January air means in Springfield
A typical January day in Springfield 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 January days reached AQI 101+ in 2019–2025.
January's median AQI of 39 is below Springfield's whole-year median of 44, making it one of the area's cleaner periods. Nationally, the median January AQI across every EPA metro area (95,602 metro-days, 2019–2025) is 39, so Springfield runs in line with the national January norm; 0.0% of its January days topped AQI 100 versus 0.7% nationally (about the same).
January is part of Springfield's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Springfield
The latest EPA AirNow observation puts Springfield's AQI at 32 (O3). The figures above are multi-year month statistics, not today's reading.
View current Springfield air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Springfield, 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.