Franklin, Idaho Air Quality
Franklin County, Idaho (ID)
↓ 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 | 24 | 54 | 155 | 310 | 47 | 4 | PM2.5 |
| 2022 | 23 | 56 | 103 | 310 | 54 | 1 | PM2.5 |
| 2021 | 28 | 66 | 119 | 285 | 74 | 6 | PM2.5 |
| 2020 | 26 | 58 | 162 | 297 | 65 | 3 | PM2.5 |
| 2019 | 23 | 54 | 112 | 315 | 46 | 3 | PM2.5 |
| 2018 | 25 | 61 | 124 | 249 | 67 | 3 | PM2.5 |
| 2017 | 37 | 69 | 172 | 239 | 112 | 14 | PM2.5 |
| 2016 | 34 | 64 | 125 | 271 | 79 | 7 | PM2.5 |
| 2015 | 28 | 57 | 170 | 285 | 45 | 5 | PM2.5 |
| 2014 | 25 | 53 | 105 | 318 | 39 | 2 | PM2.5 |
What This Means for Franklin County Residents
Franklin, Idaho has received an Air Quality Grade of B (75/100) based on a decade of EPA monitoring data. The current median AQI of 24 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 1 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 3 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.