Santa Rosa Air Quality in July
Across 2019–2025, Santa Rosa's July air quality had a median AQI of 23 (Good) over 217 monitored days in the Santa Rosa, CA area. 0.0% of July days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 41.9% of days. The cleanest July on record here was 2025 (median AQI 8, 0 days above 100) and the worst was 2019 (median 36, 0 days above 100, peak AQI 57).
- Good: 94.9%
- Moderate: 5.1%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Santa Rosa in July?
Good on a typical day: median AQI 23 across 2019–2025, with 0.0% of July days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓94.9% of July days were Good (AQI 0–50), 5.1% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the July peak was 57.
- ✓Best July: 2025; worst July: 2019.
Frequently asked questions
What is the air quality like in Santa Rosa in July?▾
Across 2019–2025, the median daily AQI in Santa Rosa in July was 23 (Good). 94.9% of days were Good, 5.1% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Santa Rosa?▾
A typical July day in Santa Rosa sits in the Good range (median AQI 23), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of July days reached AQI 101+ in 2019–2025.
Which pollutant causes Santa Rosa's July air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 41.9% of July days in Santa Rosa. The highest July AQI recorded in 2019–2025 was 57 (Moderate), in 2019.
Santa Rosa July air quality, year by year
Santa Rosa July air quality by year (Santa Rosa, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019worst | 31 | 36 | 0 | 57 | PM2.5 |
| 2020 | 31 | 30 | 0 | 57 | PM2.5 |
| 2021 | 31 | 27 | 0 | 52 | PM2.5 |
| 2022 | 31 | 21 | 0 | 46 | O3 |
| 2023 | 31 | 24 | 0 | 53 | O3 |
| 2024 | 31 | 16 | 0 | 47 | PM10 |
| 2025cleanest | 31 | 8 | 0 | 22 | PM10 |
What July air means in Santa Rosa
A typical July day in Santa Rosa sits in the Good range (median AQI 23), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of July days reached AQI 101+ in 2019–2025.
July's median AQI of 23 is below Santa Rosa's whole-year median of 36, making it one of the area's cleaner periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Santa Rosa runs below the national July norm; 0.0% of its July days topped AQI 100 versus 3.6% nationally (below average).
July is part of Santa Rosa's summer season (June, July, August); the summer 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.