Roosevelt, Montana Air Quality
Roosevelt County, Montana (MT)
→ Stableover 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 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 | 13 | 52 | 161 | 62 | 9 | 1 | PM2.5 |
| 2022 | 14 | 30 | 64 | 98 | 3 | 0 | PM2.5 |
| 2021 | 16 | 56 | 99 | 89 | 11 | 0 | PM2.5 |
| 2020 | 12 | 34 | 60 | 74 | 3 | 0 | PM2.5 |
| 2019 | 13 | 29 | 54 | 89 | 4 | 0 | PM2.5 |
| 2018 | 17 | 52 | 134 | 93 | 10 | 2 | PM2.5 |
| 2017 | 15 | 40 | 76 | 85 | 5 | 0 | PM2.5 |
| 2016 | 13 | 25 | 80 | 100 | 4 | 0 | PM2.5 |
| 2015 | 14 | 43 | 153 | 95 | 3 | 4 | PM2.5 |
| 2014 | 15 | 36 | 74 | 105 | 4 | 0 | PM2.5 |
What This Means for Roosevelt County Residents
Roosevelt, Montana has received an Air Quality Grade of B (78/100) based on a decade of EPA monitoring data. The current median AQI of 13 falls in the "Good" range.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 0 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.