Santa Rosa Air Quality in 2024
In 2024, Santa Rosa's air quality (Santa Rosa, CA area) had a median daily AQI of 19 (Good) across 366 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 348 were Good, and the year's peak AQI was 72 (Moderate). Fine particulate matter (PM2.5) set the daily AQI on 197 of those days. The cleanest month of 2024 was March (median AQI 9, 0 days above 100) and the worst was December (median 34, 0 days above 100, peak 72).
- Good: 95.1%
- Moderate: 4.9%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How was Santa Rosa's air quality in 2024?
Good on a typical day: median AQI 19, with 0 days above AQI 100 out of 366 monitored — the 2nd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 72 (Moderate).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 197 days.
- ✓Cleanest month: March; worst: December.
Frequently asked questions
What was the average AQI in Santa Rosa in 2024?▾
EPA's Air Quality System puts Santa Rosa's (Santa Rosa, CA) median daily AQI for 2024 at 19, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 72.
Which month had the worst air quality in Santa Rosa in 2024?▾
The cleanest month of 2024 was March (median AQI 9, 0 days above 100) and the worst was December (median 34, 0 days above 100, peak 72).
Was 2024 a good or bad year for Santa Rosa's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 2nd cleanest by days above AQI 100. 2024's median of 19 is below the area's typical annual median of 36.
Santa Rosa month by month in 2024
Santa Rosa air quality month by month, 2024 (Santa Rosa, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 31 | 0 | 48 | O3 |
| February | 29 | 32 | 0 | 40 | O3 |
| Marchcleanest | 31 | 9 | 0 | 24 | PM2.5 |
| April | 30 | 17 | 0 | 38 | PM2.5 |
| May | 31 | 13 | 0 | 60 | PM2.5 |
| June | 30 | 20 | 0 | 64 | PM10 |
| July | 31 | 16 | 0 | 47 | PM10 |
| August | 31 | 11 | 0 | 38 | PM10 |
| September | 30 | 9 | 0 | 25 | PM10 |
| October | 31 | 13 | 0 | 46 | PM10 |
| November | 30 | 20 | 0 | 61 | PM2.5 |
| Decemberworst | 31 | 34 | 0 | 72 | PM2.5 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 2nd cleanest by days above AQI 100.
2024's median of 19 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.