Santa Rosa Air Quality in March
Across 2019–2025, Santa Rosa's March air quality had a median AQI of 34 (Good) over 217 monitored days in the Santa Rosa, CA area. 0.0% of March days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 57.6% of days. The cleanest March on record here was 2025 (median AQI 7, 0 days above 100) and the worst was 2022 (median 39, 0 days above 100, peak AQI 51).
- Good: 99.1%
- Moderate: 0.9%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Santa Rosa in March?
Good on a typical day: median AQI 34 across 2019–2025, with 0.0% of March days above AQI 100. Ground-level ozone is the main driver.
- ✓99.1% of March days were Good (AQI 0–50), 0.9% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the March peak was 51.
- ✓Best March: 2025; worst March: 2022.
Frequently asked questions
What is the air quality like in Santa Rosa in March?▾
Across 2019–2025, the median daily AQI in Santa Rosa in March was 34 (Good). 99.1% of days were Good, 0.9% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in Santa Rosa?▾
A typical March day in Santa Rosa sits in the Good range (median AQI 34), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
Which pollutant causes Santa Rosa's March air quality problems?▾
Ground-level ozone set the daily AQI on 57.6% of March days in Santa Rosa. The highest March AQI recorded in 2019–2025 was 51 (Moderate), in 2022.
Santa Rosa March air quality, year by year
Santa Rosa March air quality by year (Santa Rosa, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 38 | 0 | 49 | O3 |
| 2020 | 31 | 39 | 0 | 51 | O3 |
| 2021 | 31 | 37 | 0 | 50 | O3 |
| 2022worst | 31 | 39 | 0 | 51 | O3 |
| 2023 | 31 | 38 | 0 | 44 | O3 |
| 2024 | 31 | 9 | 0 | 24 | PM2.5 |
| 2025cleanest | 31 | 7 | 0 | 22 | PM10 |
What March air means in Santa Rosa
A typical March day in Santa Rosa sits in the Good range (median AQI 34), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
March's median AQI of 34 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 March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so Santa Rosa runs below the national March norm; 0.0% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March is part of Santa Rosa's spring season (March, April, May); the spring 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.