Santa Rosa, California Air Quality
Santa Rosa air quality today — the AQI, the main pollutant, and whether it’s safe to exercise outside right now
Santa Rosa, CA · Air quality right now
The air quality index in Santa Rosa, CA is 32 (Good) right now — safe for outdoor activity.
Is it safe to be outside in Santa Rosa today?
AQI 32 Yes — air quality is Good
Air is clean — great for outdoor activity.Main pollutant: PM2.5Observed 8:00 AM PDT
Pollutants right now
- PM2.55.4 µg/m³Main pollutantfine particles — smoke, exhaust, soot
- PM107.2 µg/m³coarse particles — dust, pollen, ash
- Ozone39 µg/m³smog — builds on hot, sunny days
- NO₂4.0 µg/m³nitrogen dioxide — traffic, combustion
ExerciseOK to run — no air-quality limits on outdoor exercise.
How to read Santa Rosa’s air quality
Guides: The AQI Scale, Explained · Air Quality Alerts, Decoded · How to Read a Wildfire Smoke Map · Why Wildfire Smoke Travels 1,000 Miles.
Air quality over time in Santa Rosa
Across the EPA’s county records from 2020 to 2025, Santa Rosa’s cleanest year was 2025 (median AQI 9) and its most polluted was 2021 (median AQI 37); the typical (median) day has trended cleaner since 2020.
| Year | Median AQI | Unhealthy+ | Main pollutant | USG | Moderate | Good |
|---|---|---|---|---|---|---|
| 2020 | 36 | 6 | PM2.5 | 1 | 69 | 290 |
| 2021 | 37 | 0 | PM2.5 | 0 | 82 | 283 |
| 2022 | 36 | 0 | Ozone | 0 | 79 | 286 |
| 2023 | 33 | 0 | Ozone | 2 | 40 | 323 |
| 2024 | 19 | 0 | PM2.5 | 0 | 18 | 348 |
| 2025 | 9 | 0 | PM10 | 0 | 0 | 365 |
“USG” is Unhealthy for Sensitive Groups (AQI 101–150); “Unhealthy+” combines the Unhealthy, Very Unhealthy, and Hazardous days. In 2024 the EPA tightened the annual fine-particle (PM2.5) standard to 9 µg/m³ from the previous 12 µg/m³, so counties near the old limit read worse against the new one. Source: EPA AQS annual summaries, 2020–2025.
Frequently asked
- What was the worst year for air quality in Santa Rosa?
- In the EPA's 2020–2025 county records, 2020 had the most days above AQI 100: 7 days (1 Unhealthy for Sensitive Groups, 6 Unhealthy or worse). The highest median AQI came in 2021 (37; 2020's was 36).
- How many unhealthy air days does Santa Rosa have?
- Across 2020–2025, under 1% of the days reported for Santa Rosa's county had an AQI above 100 (9 of 2192), about 2 days a year. 2025 had 0 days.
- What's the main air pollutant in Santa Rosa?
- PM2.5 drove Santa Rosa's county AQI on the most days in 3 of 6 years (2020–2025); Ozone in 2022, 2023; PM10 in 2025.