Yolo, California Air Quality
Yolo has a median AQI of 47, earning an air quality grade of B+ — good air quality that ranks better than 21% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Yolo recorded 165 good air quality days (60% of monitored days).
Population: 800 • County: Yolo
Current AQI
Quick Facts
| Current AQI | 35 — Good |
| Air Quality Grade | B+ |
| Median AQI (2025) | 47 |
| vs. U.S. Cities | Better than 21% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | ↓ Worsening |
| 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 Yolo is sourced from the Woodland monitoring area, located approximately 7 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Yolo 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
Yolo Median AQI by Year
Annual EPA air quality data for Yolo — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 47 | 165 | — | 100 | PM2.5 |
| 2024 | 45 | 238 | 1 | 118 | Ozone |
| 2023 | 43 | 246 | 2 | 108 | Ozone |
| 2022 | 42 | 283 | 2 | 101 | Ozone |
| 2021 | 42 | 242 | 6 | 159 | Ozone |
| 2020 | 45 | 215 | 28 | 209 | PM2.5 |
| 2019 | 43 | 252 | 1 | 136 | Ozone |
| 2018 | 45 | 216 | 14 | 260 | Ozone |
| 2017 | 45 | 228 | 7 | 154 | Ozone |
| 2016 | 43 | 246 | 4 | 115 | 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 Yolo Air Quality
What is the air quality in Yolo today?
The current AQI in Yolo is 35, 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 Yolo getting better or worse?
Air quality in Yolo has been worsening. The median AQI has risen 4 points (from 43 in 2016 to 47 in 2025), a concern for local health officials.
What is the most common air pollutant in Yolo?
PM2.5 is the primary air pollutant in Yolo, responsible for 141 days (52% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Yolo have per year?
In 2025, Yolo recorded 60% good air quality days (165 days) out of 273 monitored days. There were 0 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 100.
What air quality grade does Yolo receive?
Yolo receives an air quality grade of B+, placing it better than 21% of US cities. This is based on a median AQI of 47 in 2025, with 165 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 21% of US cities
Nearby Cities
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National Rankings
See how Yolo compares to every other US city by air quality.
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