Kelseyville, California Air Quality
Kelseyville has a median AQI of 17, earning an air quality grade of A+ — excellent air quality that ranks better than 96% of US cities. Air quality has been improving steadily over the past decade, a positive sign for residents. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Kelseyville recorded 34 good air quality days (100% of monitored days).
Population: 4,011 • County: Lake
Current AQI
Quick Facts
| Current AQI | 27 — Good |
| Air Quality Grade | A+ |
| Median AQI (2025) | 17 |
| vs. U.S. Cities | Better than 96% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | ↑ Improving |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Kelseyville is sourced from the Ukiah Library monitoring area, located approximately 24 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Kelseyville typically sees its worst air quality during summer afternoons when heat and sunlight drive ground-level ozone formation from vehicle and industrial emissions. Morning readings are generally 15–25 points lower than afternoon peaks. Outdoor activity is best planned for early morning on high-ozone days.
AQI Trend (10 Years)
Air Quality Days by Year
Kelseyville Median AQI by Year
Annual EPA air quality data for Kelseyville — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 17 | 34 | — | 32 | PM2.5 |
| 2024 | 32 | 361 | — | 67 | Ozone |
| 2023 | 32 | 357 | — | 67 | Ozone |
| 2022 | 32 | 359 | — | 76 | Ozone |
| 2021 | 33 | 348 | 1 | 157 | Ozone |
| 2020 | 32 | 341 | 4 | 190 | Ozone |
| 2019 | 31 | 360 | — | 50 | Ozone |
| 2018 | 33 | 344 | 3 | 233 | Ozone |
| 2017 | 35 | 350 | 2 | 172 | Ozone |
| 2016 | 33 | 356 | — | 74 | Ozone |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Kelseyville Air Quality
What is the air quality in Kelseyville today?
The current AQI in Kelseyville is 27, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Kelseyville getting better or worse?
Air quality in Kelseyville has been improving. The median AQI has dropped 16 points (from 33 in 2016 to 17 in 2025), a positive trend for residents.
What is the most common air pollutant in Kelseyville?
PM2.5 is the primary air pollutant in Kelseyville, responsible for 30 days (88% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Kelseyville have per year?
In 2025, Kelseyville recorded 100% good air quality days (34 days) out of 34 monitored days. There were 0 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 32.
What air quality grade does Kelseyville receive?
Kelseyville receives an air quality grade of A+, placing it better than 96% of US cities. This is based on a median AQI of 17 in 2025, with 34 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 96% of US cities
Nearby Cities
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National Rankings
See how Kelseyville compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Kelseyville
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