Wasco, Oregon Air Quality
Wasco 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 | 27 | 55 | 214 | 244 | 40 | 5 | PM2.5 |
| 2022 | 16 | 23 | 50 | 161 | 0 | 0 | PM2.5 |
| 2021 | 22 | 51 | 163 | 287 | 30 | 2 | PM2.5 |
| 2020 | 24 | 54 | 599 | 307 | 45 | 3 | PM2.5 |
| 2019 | 31 | 62 | 89 | 262 | 88 | 0 | PM2.5 |
| 2018 | 37 | 59 | 156 | 256 | 73 | 5 | PM2.5 |
| 2017 | 39 | 72 | 278 | 249 | 99 | 16 | PM2.5 |
| 2016 | 34 | 55 | 80 | 297 | 61 | 0 | PM2.5 |
| 2015 | 27 | 55 | 158 | 300 | 56 | 2 | PM2.5 |
| 2014 | 24 | 55 | 101 | 306 | 58 | 1 | PM2.5 |
What This Means for Wasco County Residents
Wasco, Oregon has received an Air Quality Grade of B (79/100) based on a decade of EPA monitoring data. The current median AQI of 27 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 3 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 2 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.