Rockford Air Quality in 2025
In 2025, Rockford's air quality (Rockford, IL area) had a median daily AQI of 40 (Good) across 355 monitored days. 6 days (1.7%) reached Unhealthy for Sensitive Groups or worse, 244 were Good, and the year's peak AQI was 169 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 215 of those days. The cleanest month of 2025 was January (median AQI 27, 0 days above 100) and the worst was July (median 49, 2 days above 100, peak 169).
- Good: 68.7%
- Moderate: 29.6%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 0.3%
Improve Indoor Air Quality
Even with good outdoor air in Rockford, 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 was Rockford's air quality in 2025?
Good on a typical day: median AQI 40, with 6 days above AQI 100 out of 355 monitored — the 6th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 169 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 215 days.
- ✓Cleanest month: January; worst: July.
Frequently asked questions
What was the average AQI in Rockford in 2025?▾
EPA's Air Quality System puts Rockford's (Rockford, IL) median daily AQI for 2025 at 40, which is Good. 6 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 169.
Which month had the worst air quality in Rockford in 2025?▾
The cleanest month of 2025 was January (median AQI 27, 0 days above 100) and the worst was July (median 49, 2 days above 100, peak 169).
Was 2025 a good or bad year for Rockford's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100. 2025's median of 40 is below the area's typical annual median of 47.
Rockford month by month in 2025
Rockford air quality month by month, 2025 (Rockford, IL, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januarycleanest | 24 | 27 | 0 | 65 | PM2.5 |
| February | 25 | 33 | 0 | 65 | PM2.5 |
| March | 31 | 36 | 0 | 69 | O3 |
| April | 30 | 41 | 0 | 64 | O3 |
| May | 31 | 41 | 0 | 80 | O3 |
| June | 30 | 57 | 1 | 108 | O3 |
| Julyworst | 31 | 49 | 2 | 169 | PM2.5 |
| August | 31 | 39 | 2 | 117 | PM2.5 |
| September | 30 | 52 | 1 | 112 | O3 |
| October | 31 | 36 | 0 | 71 | O3 |
| November | 30 | 38 | 0 | 68 | PM2.5 |
| December | 31 | 46 | 0 | 66 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100.
2025's median of 40 is below 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 22 (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.