Air Quality in Mendocino County
See the latest available air quality readings for our communities and where they fall on the U.S. Air Quality Index (AQI). Lower AQI numbers mean cleaner air.
Understand the AQI
Lower numbers mean cleaner air.
Community readings
Feeds checked every 15 minutesFort Bragg
Observed on 11/08/26 12:00 AM PST
Ukiah
Observed on 11/08/26 12:00 AM PST
Willits
Observed on 11/08/26 12:00 AM PST
Countywide ozone
Observed on 11/08/26 12:00 AM PST
Source: AirNow · U.S. EPA AQI scale · Values above 500 are beyond the AQI scale.
Why is ozone shown countywide?
Ozone is measured in Ukiah and represents ozone conditions for Mendocino County. Particle pollution is reported separately for Fort Bragg (PM10), Ukiah (PM2.5), and Willits (PM2.5).
About these readings
Readings come from AirNow feeds and are cached for 15 minutes. Observation times may differ by station. “Unavailable” means the feed did not supply a reading; it does not indicate clean air.
Stay informed about air quality
Visit AirNow for additional air quality information, maps, and forecasts. For email notifications about air quality changes, select Resources → EnviroFlash emails on AirNow, or use the signup link below. Choose your location and preferred alert level, where available.
Learn more about the U.S. EPA Air Quality Index and its six color categories.