Santa Rosa Air Quality in February
Across 2019–2025, Santa Rosa's February air quality had a median AQI of 36 (Good) over 198 monitored days in the Santa Rosa, CA area. 0.0% of February days (0 of 198) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 48.5% of days. The cleanest February on record here was 2025 (median AQI 7, 0 days above 100) and the worst was 2022 (median 45, 0 days above 100, peak AQI 58).
- Good: 89.9%
- Moderate: 10.1%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Santa Rosa in February?
Good on a typical day: median AQI 36 across 2019–2025, with 0.0% of February days above AQI 100. Ground-level ozone is the main driver.
- ✓89.9% of February days were Good (AQI 0–50), 10.1% Moderate (51–100).
- ✓0 days of 198 reached AQI 101+; the February peak was 65.
- ✓Best February: 2025; worst February: 2022.
Frequently asked questions
What is the air quality like in Santa Rosa in February?▾
Across 2019–2025, the median daily AQI in Santa Rosa in February was 36 (Good). 89.9% of days were Good, 10.1% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in Santa Rosa?▾
A typical February day in Santa Rosa sits in the Good range (median AQI 36), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
Which pollutant causes Santa Rosa's February air quality problems?▾
Ground-level ozone set the daily AQI on 48.5% of February days in Santa Rosa. The highest February AQI recorded in 2019–2025 was 65 (Moderate), in 2022.
Santa Rosa February air quality, year by year
Santa Rosa February air quality by year (Santa Rosa, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 28 | 36 | 0 | 47 | O3 |
| 2020 | 29 | 37 | 0 | 53 | PM2.5 |
| 2021 | 28 | 35 | 0 | 49 | PM2.5 |
| 2022worst | 28 | 45 | 0 | 58 | PM2.5 |
| 2023 | 28 | 39 | 0 | 65 | PM2.5 |
| 2024 | 29 | 32 | 0 | 40 | O3 |
| 2025cleanest | 28 | 7 | 0 | 17 | PM10 |
What February air means in Santa Rosa
A typical February day in Santa Rosa sits in the Good range (median AQI 36), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
February's median AQI of 36 is in line with Santa Rosa's whole-year median of 36, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so Santa Rosa runs below the national February norm; 0.0% of its February days topped AQI 100 versus 0.4% nationally (about the same).
February is part of Santa Rosa's winter season (December, January, February); the winter page pools all three months.
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 month 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.