Franklin, Washington Air Quality
Franklin 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 | 52 | 255 | 270 | 32 | 5 | PM2.5 |
| 2022 | 23 | 55 | 170 | 269 | 56 | 3 | PM2.5 |
| 2021 | 21 | 45 | 84 | 297 | 23 | 0 | PM2.5 |
| 2020 | 18 | 46 | 284 | 313 | 15 | 8 | PM2.5 |
| 2019 | 21 | 53 | 74 | 288 | 45 | 0 | PM2.5 |
| 2018 | 23 | 57 | 182 | 300 | 53 | 7 | PM2.5 |
| 2017 | 26 | 58 | 206 | 261 | 62 | 8 | PM2.5 |
| 2016 | 18 | 35 | 81 | 318 | 14 | 0 | PM2.5 |
| 2015 | 27 | 55 | 139 | 300 | 56 | 3 | PM2.5 |
| 2014 | 25 | 52 | 83 | 272 | 39 | 0 | PM2.5 |
What This Means for Franklin County Residents
Franklin, Washington has received an Air Quality Grade of B (73/100) 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 3 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.