Yankee Hill, California Air Quality
Yankee Hill 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 improving steadily over the past decade, a positive sign for residents. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, Yankee Hill recorded 162 good air quality days (66% of monitored days).
Population: 232 • County: Butte
Current AQI
Quick Facts
| Current AQI | 33 — Good |
| Air Quality Grade | B+ |
| Median AQI (2025) | 47 |
| vs. U.S. Cities | Better than 21% |
| Primary Pollutant | Ozone |
| 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 Yankee Hill is sourced from the Paradise - Clark Road monitoring area, located approximately 6 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
Yankee Hill 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
Yankee Hill Median AQI by Year
Annual EPA air quality data for Yankee Hill — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 47 | 162 | — | 96 | Ozone |
| 2024 | 46 | 231 | 2 | 213 | Ozone |
| 2023 | 50 | 191 | — | 100 | Ozone |
| 2022 | 50 | 191 | 3 | 119 | Ozone |
| 2021 | 53 | 160 | 31 | 257 | PM2.5 |
| 2020 | 54 | 149 | 39 | 508 | PM2.5 |
| 2019 | 51 | 171 | 5 | 180 | PM2.5 |
| 2018 | 59 | 97 | 40 | 682 | PM2.5 |
| 2017 | 59 | 100 | 24 | 155 | PM2.5 |
| 2016 | 57 | 115 | 16 | 127 | PM2.5 |
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 Yankee Hill Air Quality
What is the air quality in Yankee Hill today?
The current AQI in Yankee Hill is 33, 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 Yankee Hill getting better or worse?
Air quality in Yankee Hill has been improving. The median AQI has dropped 10 points (from 57 in 2016 to 47 in 2025), a positive trend for residents.
What is the most common air pollutant in Yankee Hill?
Ozone is the primary air pollutant in Yankee Hill, responsible for 139 days (57% of monitored days) in 2025. Ground-level ozone forms when sunlight reacts with emissions from vehicles and industry, typically peaking on hot summer afternoons.
How many unhealthy air days does Yankee Hill have per year?
In 2025, Yankee Hill recorded 66% good air quality days (162 days) out of 245 monitored days. There were 0 Unhealthy for Sensitive Groups days and 0 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 96.
What air quality grade does Yankee Hill receive?
Yankee Hill 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 162 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 Yankee Hill compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Yankee Hill
Yankee Hill has a summer ozone problem — hot afternoons push AQI into Moderate or higher as sunlight converts vehicle and industrial emissions into ground-level ozone. Activated carbon and PECO filters chemically neutralize ozone rather than just trapping particles.
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