Twin Falls, Idaho Air Quality
Twin Falls County, Idaho (ID)
↓ Improvingover 9 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 | 25 | 42 | 80 | 328 | 16 | 0 | PM2.5 |
| 2022 | 31 | 55 | 155 | 280 | 71 | 2 | PM2.5 |
| 2021 | 28 | 61 | 144 | 298 | 56 | 7 | PM2.5 |
| 2020 | 24 | 56 | 163 | 313 | 44 | 7 | PM2.5 |
| 2019 | 26 | 43 | 74 | 344 | 21 | 0 | PM2.5 |
| 2018 | 39 | 60 | 151 | 271 | 79 | 5 | PM2.5 |
| 2017 | 46 | 69 | 154 | 168 | 114 | 6 | PM2.5 |
| 2016 | 22 | 42 | 69 | 333 | 19 | 0 | PM2.5 |
| 2015 | 32 | 53 | 141 | 237 | 35 | 3 | PM2.5 |
What This Means for Twin Falls County Residents
Twin Falls, Idaho has received an Air Quality Grade of B (76/100) based on a decade of EPA monitoring data. The current median AQI of 25 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 7 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.