Sonoma, California Air Quality
Sonoma County, California (CA)
↓ Improvingover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). This area has seen measurable air quality improvement over the decade.
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 33 | 51 | 117 | 323 | 40 | 2 | Ozone |
| 2022 | 36 | 56 | 82 | 286 | 79 | 0 | Ozone |
| 2021 | 37 | 57 | 89 | 283 | 82 | 0 | PM2.5 |
| 2020 | 36 | 57 | 199 | 290 | 69 | 7 | PM2.5 |
| 2019 | 36 | 52 | 87 | 318 | 47 | 0 | Ozone |
| 2018 | 39 | 57 | 250 | 304 | 48 | 13 | Ozone |
| 2017 | 41 | 60 | 169 | 267 | 93 | 5 | Ozone |
| 2016 | 34 | 51 | 87 | 323 | 43 | 0 | Ozone |
| 2015 | 37 | 58 | 90 | 293 | 72 | 0 | Ozone |
| 2014 | 42 | 58 | 83 | 257 | 108 | 0 | PM2.5 |
What This Means for Sonoma County Residents
Sonoma, California has received an Air Quality Grade of B (71/100) based on a decade of EPA monitoring data. The current median AQI of 33 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 9 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 2 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.