Santa Rosa Air Quality in 2023
In 2023, Santa Rosa's air quality (Santa Rosa, CA area) had a median daily AQI of 33 (Good) across 365 monitored days. 2 days (0.5%) reached Unhealthy for Sensitive Groups or worse, 323 were Good, and the year's peak AQI was 117 (Unhealthy for Sensitive Groups). Ground-level ozone set the daily AQI on 236 of those days. The cleanest month of 2023 was July (median AQI 24, 0 days above 100) and the worst was September (median 28, 2 days above 100, peak 117).
- Good: 88.5%
- Moderate: 11.0%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Santa Rosa
Today's main pollutant in Santa Rosa is ground-level ozone (AQI 15). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How was Santa Rosa's air quality in 2023?
Good on a typical day: median AQI 33, with 2 days above AQI 100 out of 365 monitored — the 6th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2023: 117 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone was the main pollutant on 236 days.
- ✓Cleanest month: July; worst: September.
Frequently asked questions
What was the average AQI in Santa Rosa in 2023?▾
EPA's Air Quality System puts Santa Rosa's (Santa Rosa, CA) median daily AQI for 2023 at 33, which is Good. 2 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 117.
Which month had the worst air quality in Santa Rosa in 2023?▾
The cleanest month of 2023 was July (median AQI 24, 0 days above 100) and the worst was September (median 28, 2 days above 100, peak 117).
Was 2023 a good or bad year for Santa Rosa's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 6th cleanest by days above AQI 100. 2023's median of 33 is below the area's typical annual median of 36.
Santa Rosa month by month in 2023
Santa Rosa air quality month by month, 2023 (Santa Rosa, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 37 | 0 | 55 | PM2.5 |
| February | 28 | 39 | 0 | 65 | PM2.5 |
| March | 31 | 38 | 0 | 44 | O3 |
| April | 30 | 37 | 0 | 43 | O3 |
| May | 31 | 31 | 0 | 57 | O3 |
| June | 30 | 27 | 0 | 49 | O3 |
| Julycleanest | 31 | 24 | 0 | 53 | O3 |
| August | 31 | 26 | 0 | 85 | O3 |
| Septemberworst | 30 | 28 | 2 | 117 | O3 |
| October | 31 | 31 | 0 | 51 | O3 |
| November | 30 | 34 | 0 | 57 | PM2.5 |
| December | 31 | 35 | 0 | 67 | PM2.5 |
How 2023 compares
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 6th cleanest by days above AQI 100.
2023's median of 33 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 15 (O3). 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.