Santa Rosa Air Quality in 2025
In 2025, Santa Rosa's air quality (Santa Rosa, CA area) had a median daily AQI of 9 (Good) across 365 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 365 were Good, and the year's peak AQI was 39 (Good). Coarse dust (PM10) set the daily AQI on 365 of those days. The cleanest month of 2025 was February (median AQI 7, 0 days above 100) and the worst was June (median 15, 0 days above 100, peak 31).
- Good: 100.0%
- Moderate: 0.0%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How was Santa Rosa's air quality in 2025?
Good on a typical day: median AQI 9, with 0 days above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 39 (Good).
- ✓Coarse dust (PM10) was the main pollutant on 365 days.
- ✓Cleanest month: February; worst: June.
Frequently asked questions
What was the average AQI in Santa Rosa in 2025?▾
EPA's Air Quality System puts Santa Rosa's (Santa Rosa, CA) median daily AQI for 2025 at 9, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 39.
Which month had the worst air quality in Santa Rosa in 2025?▾
The cleanest month of 2025 was February (median AQI 7, 0 days above 100) and the worst was June (median 15, 0 days above 100, peak 31).
Was 2025 a good or bad year for Santa Rosa's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2025's median of 9 is below the area's typical annual median of 36.
Santa Rosa month by month in 2025
Santa Rosa air quality month by month, 2025 (Santa Rosa, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 14 | 0 | 39 | PM10 |
| Februarycleanest | 28 | 7 | 0 | 17 | PM10 |
| March | 31 | 7 | 0 | 22 | PM10 |
| April | 30 | 9 | 0 | 28 | PM10 |
| May | 31 | 13 | 0 | 23 | PM10 |
| Juneworst | 30 | 15 | 0 | 31 | PM10 |
| July | 31 | 8 | 0 | 22 | PM10 |
| August | 31 | 11 | 0 | 19 | PM10 |
| September | 30 | 9 | 0 | 22 | PM10 |
| October | 31 | 7 | 0 | 17 | PM10 |
| November | 30 | 7 | 0 | 13 | PM10 |
| December | 31 | 9 | 0 | 17 | PM10 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2025's median of 9 is below the area's typical annual median of 36.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Santa Rosa
The latest EPA AirNow observation puts Santa Rosa's AQI at 36 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Santa Rosa air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Santa Rosa, CA), 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.