Whitman, Washington Air Quality
Whitman County, Washington (WA)
→ Stableover 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).
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 | 53 | 326 | 323 | 40 | 2 | PM2.5 |
| 2022 | 24 | 56 | 190 | 306 | 55 | 4 | PM2.5 |
| 2021 | 22 | 58 | 218 | 310 | 45 | 10 | PM2.5 |
| 2020 | 19 | 47 | 237 | 335 | 23 | 8 | PM2.5 |
| 2019 | 24 | 51 | 71 | 324 | 41 | 0 | PM2.5 |
| 2018 | 22 | 58 | 187 | 303 | 55 | 7 | PM2.5 |
| 2017 | 24 | 58 | 210 | 299 | 56 | 10 | PM2.5 |
| 2016 | 23 | 44 | 86 | 344 | 22 | 0 | PM2.5 |
| 2015 | 26 | 56 | 185 | 297 | 57 | 8 | PM2.5 |
| 2014 | 26 | 52 | 95 | 320 | 43 | 0 | PM2.5 |
What This Means for Whitman County Residents
Whitman, Washington has received an Air Quality Grade of B (72/100) based on a decade of EPA monitoring data. The current median AQI of 26 falls in the "Good" range.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 5 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.