Box Elder, Utah Air Quality
Box Elder County, Utah (UT)
↓ 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 | 38 | 54 | 96 | 302 | 58 | 0 | Ozone |
| 2022 | 35 | 47 | 90 | 266 | 15 | 0 | Ozone |
| 2021 | 42 | 67 | 119 | 281 | 78 | 4 | Ozone |
| 2020 | 40 | 51 | 147 | 316 | 36 | 3 | Ozone |
| 2019 | 41 | 54 | 121 | 300 | 62 | 2 | Ozone |
| 2018 | 48 | 84 | 151 | 201 | 155 | 9 | Ozone |
| 2017 | 48 | 80 | 154 | 207 | 147 | 11 | Ozone |
| 2016 | 41 | 70 | 120 | 269 | 93 | 4 | Ozone |
| 2015 | 45 | 71 | 120 | 249 | 111 | 5 | Ozone |
| 2014 | 45 | 67 | 156 | 256 | 103 | 6 | Ozone |
What This Means for Box Elder County Residents
Box Elder, Utah has received an Air Quality Grade of B (73/100) based on a decade of EPA monitoring data. The current median AQI of 38 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 Ground-Level Ozone. Over the past 5 years, this area has averaged 2 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.