Springfield, IL Air Quality in 2020
In 2020, Springfield's air quality (Springfield, IL area) had a median daily AQI of 44 (Good) across 364 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 254 were Good, and the year's peak AQI was 97 (Moderate). Fine particulate matter (PM2.5) set the daily AQI on 211 of those days. The cleanest month of 2020 was November (median AQI 34, 0 days above 100) and the worst was December (median 52, 0 days above 100, peak 70).
- Good: 69.8%
- Moderate: 30.2%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How was Springfield's air quality in 2020?
Good on a typical day: median AQI 44, with 0 days above AQI 100 out of 364 monitored — the 2nd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2020: 97 (Moderate).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 211 days.
- ✓Cleanest month: November; worst: December.
Frequently asked questions
What was the average AQI in Springfield in 2020?▾
EPA's Air Quality System puts Springfield's (Springfield, IL) median daily AQI for 2020 at 44, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 97.
Which month had the worst air quality in Springfield in 2020?▾
The cleanest month of 2020 was November (median AQI 34, 0 days above 100) and the worst was December (median 52, 0 days above 100, peak 70).
Was 2020 a good or bad year for Springfield's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 2nd cleanest by days above AQI 100. 2020's median of 44 is in line with the area's typical annual median of 44.
Springfield month by month in 2020
Springfield air quality month by month, 2020 (Springfield, IL, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 29 | 43 | 0 | 60 | PM2.5 |
| February | 29 | 42 | 0 | 60 | PM2.5 |
| March | 31 | 42 | 0 | 68 | O3 |
| April | 30 | 45 | 0 | 58 | O3 |
| May | 31 | 42 | 0 | 54 | O3 |
| June | 30 | 52 | 0 | 93 | O3 |
| July | 31 | 44 | 0 | 97 | O3 |
| August | 31 | 43 | 0 | 58 | O3 |
| September | 30 | 43 | 0 | 62 | PM2.5 |
| October | 31 | 40 | 0 | 80 | PM2.5 |
| Novembercleanest | 30 | 34 | 0 | 61 | PM2.5 |
| Decemberworst | 31 | 52 | 0 | 70 | PM2.5 |
How 2020 compares
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 2nd cleanest by days above AQI 100.
2020's median of 44 is in line with the area's typical annual median of 44.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Springfield
The latest EPA AirNow observation puts Springfield's AQI at 25 (PM2.5). The figures above are multi-year annual 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.