Ada, Idaho Air Quality
Ada County, Idaho (ID)
↑ Worseningover 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 in this area has been declining over the past 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 | 44 | 64 | 120 | 251 | 111 | 3 | Ozone |
| 2022 | 48 | 75 | 166 | 196 | 162 | 7 | Ozone |
| 2021 | 46 | 79 | 173 | 223 | 124 | 18 | Ozone |
| 2020 | 44 | 76 | 198 | 242 | 106 | 18 | PM2.5 |
| 2019 | 41 | 58 | 100 | 266 | 99 | 0 | Ozone |
| 2018 | 42 | 72 | 134 | 266 | 92 | 7 | Ozone |
| 2017 | 46 | 87 | 196 | 217 | 126 | 22 | Ozone |
| 2016 | 41 | 68 | 116 | 271 | 88 | 7 | Ozone |
| 2015 | 41 | 64 | 172 | 276 | 80 | 9 | Ozone |
| 2014 | 41 | 61 | 152 | 277 | 87 | 1 | Ozone |
What This Means for Ada County Residents
Ada, Idaho has received an Air Quality Grade of C (55/100) based on a decade of EPA monitoring data. The current median AQI of 44 falls in the "Good" range.
Concerning trends show air quality has been declining, with the median AQI rising by 3 points over the monitoring period. This could be driven by increased development, wildfire smoke, or industrial activity.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 9 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.