Rockford Air Quality in 2020
In 2020, Rockford's air quality (Rockford, IL area) had a median daily AQI of 47 (Good) across 366 monitored days. 1 day (0.3%) reached Unhealthy for Sensitive Groups or worse, 205 were Good, and the year's peak AQI was 101 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 282 of those days. The cleanest month of 2020 was January (median AQI 41, 0 days above 100) and the worst was June (median 51, 1 day above 100, peak 101).
- Good: 56.0%
- Moderate: 43.7%
- Unhealthy for Sensitive Groups: 0.3%
- Unhealthy or worse: 0.0%
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How was Rockford's air quality in 2020?
Good on a typical day: median AQI 47, with 1 day above AQI 100 out of 366 monitored — the 3rd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2020: 101 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 282 days.
- ✓Cleanest month: January; worst: June.
Frequently asked questions
What was the average AQI in Rockford in 2020?▾
EPA's Air Quality System puts Rockford's (Rockford, IL) median daily AQI for 2020 at 47, which is Good. 1 day were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 101.
Which month had the worst air quality in Rockford in 2020?▾
The cleanest month of 2020 was January (median AQI 41, 0 days above 100) and the worst was June (median 51, 1 day above 100, peak 101).
Was 2020 a good or bad year for Rockford's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 3rd cleanest by days above AQI 100. 2020's median of 47 is in line with the area's typical annual median of 47.
Rockford month by month in 2020
Rockford air quality month by month, 2020 (Rockford, IL, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januarycleanest | 31 | 41 | 0 | 78 | PM2.5 |
| February | 29 | 42 | 0 | 69 | PM2.5 |
| March | 31 | 51 | 0 | 67 | PM2.5 |
| April | 30 | 48 | 0 | 74 | PM2.5 |
| May | 31 | 41 | 0 | 55 | O3 |
| Juneworst | 30 | 51 | 1 | 101 | O3 |
| July | 31 | 48 | 0 | 96 | PM2.5 |
| August | 31 | 52 | 0 | 90 | PM2.5 |
| September | 30 | 41 | 0 | 65 | PM2.5 |
| October | 31 | 44 | 0 | 61 | PM2.5 |
| November | 30 | 51 | 0 | 71 | PM2.5 |
| December | 31 | 53 | 0 | 87 | PM2.5 |
How 2020 compares
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 3rd cleanest by days above AQI 100.
2020's median of 47 is in line with the area's typical annual median of 47.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Rockford
The latest EPA AirNow observation puts Rockford's AQI at 30 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Rockford air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Rockford, 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.