Union, Oregon Air Quality
Union County, Oregon (OR)
↓ 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 | 26 | 54 | 95 | 305 | 56 | 0 | PM2.5 |
| 2022 | 28 | 57 | 130 | 283 | 74 | 4 | PM2.5 |
| 2021 | 27 | 61 | 170 | 304 | 49 | 7 | PM2.5 |
| 2020 | 27 | 56 | 326 | 300 | 57 | 9 | PM2.5 |
| 2019 | 26 | 53 | 88 | 313 | 52 | 0 | PM2.5 |
| 2018 | 32 | 59 | 192 | 282 | 74 | 6 | PM2.5 |
| 2017 | 31 | 66 | 218 | 277 | 77 | 11 | PM2.5 |
| 2016 | 24 | 56 | 99 | 297 | 67 | 0 | PM2.5 |
| 2015 | 38 | 69 | 191 | 254 | 97 | 11 | PM2.5 |
| 2014 | 34 | 75 | 140 | 255 | 102 | 6 | PM2.5 |
What This Means for Union County Residents
Union, Oregon has received an Air Quality Grade of B (76/100) based on a decade of EPA monitoring data. The current median AQI of 26 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 8 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 4 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.