Silver Bow, Montana Air Quality
Silver Bow County, Montana (MT)
↓ 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 | 31 | 66 | 124 | 268 | 94 | 3 | PM2.5 |
| 2022 | 27 | 67 | 162 | 268 | 87 | 10 | PM2.5 |
| 2021 | 33 | 80 | 163 | 256 | 89 | 20 | PM2.5 |
| 2020 | 22 | 61 | 181 | 289 | 69 | 8 | PM2.5 |
| 2019 | 24 | 60 | 92 | 293 | 70 | 0 | PM2.5 |
| 2018 | 25 | 61 | 120 | 284 | 78 | 1 | PM2.5 |
| 2017 | 46 | 93 | 191 | 188 | 142 | 24 | PM2.5 |
| 2016 | 29 | 63 | 94 | 283 | 83 | 0 | PM2.5 |
| 2015 | 39 | 69 | 175 | 239 | 116 | 10 | PM2.5 |
| 2014 | 40 | 66 | 108 | 232 | 129 | 1 | PM2.5 |
What This Means for Silver Bow County Residents
Silver Bow, Montana has received an Air Quality Grade of B (77/100) based on a decade of EPA monitoring data. The current median AQI of 31 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 9 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 8 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.