Santa Rosa Air Quality in Spring
Across 2019–2025, Santa Rosa's spring (March–May) air quality had a median AQI of 32 (Good) over 644 monitored days in the Santa Rosa, CA area. 0.0% of spring days (0 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 55.0% of days. The cleanest spring on record here was 2025 (median AQI 9, 0 days above 100) and the worst was 2019 (median 38, 0 days above 100, peak AQI 60).
- Good: 95.2%
- Moderate: 4.8%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Santa Rosa in spring?
Good on a typical day: median AQI 32 across 2019–2025, with 0.0% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓95.2% of spring days were Good (AQI 0–50), 4.8% Moderate (51–100).
- ✓0 days of 644 reached AQI 101+; the spring peak was 62.
- ✓Cleanest month: May; worst month: March.
Frequently asked questions
What is the air quality like in Santa Rosa in spring?▾
Across 2019–2025, the median daily AQI in Santa Rosa in spring was 32 (Good). 95.2% of days were Good, 4.8% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Santa Rosa?▾
A typical spring day in Santa Rosa sits in the Good range (median AQI 32), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Which pollutant causes Santa Rosa's spring air quality problems?▾
Ground-level ozone set the daily AQI on 55.0% of spring days in Santa Rosa. The highest spring AQI recorded in 2019–2025 was 62 (Moderate), in 2019.
Santa Rosa spring air quality, year by year
Santa Rosa spring air quality by year (Santa Rosa, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019worst | 92 | 38 | 0 | 60 | O3 |
| 2020 | 92 | 35 | 0 | 51 | O3 |
| 2021 | 92 | 37 | 0 | 59 | O3 |
| 2022 | 92 | 37 | 0 | 62 | O3 |
| 2023 | 92 | 36 | 0 | 57 | O3 |
| 2024 | 92 | 13 | 0 | 60 | PM2.5 |
| 2025cleanest | 92 | 9 | 0 | 28 | PM10 |
What spring air means in Santa Rosa
A typical spring day in Santa Rosa sits in the Good range (median AQI 32), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of spring days reached AQI 101+ in 2019–2025.
Spring's median AQI of 32 is below Santa Rosa's whole-year median of 36, making it one of the area's cleaner periods. Nationally, the median Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Santa Rosa runs below the national Spring norm; 0.0% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, May is the cleanest month (median AQI 31, 0.0% of days above 100) and March the worst (median 34, 0.0% above 100).
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 season 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.