Lake, Montana Air Quality
Lake 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 | 43 | 157 | 101 | 6 | 2 | PM2.5 |
| 2022 | 11 | 37 | 120 | 93 | 3 | 1 | PM2.5 |
| 2021 | 9 | 57 | 152 | 105 | 9 | 3 | PM2.5 |
| 2020 | 7 | 27 | 183 | 111 | 3 | 3 | PM2.5 |
| 2019 | 10 | 26 | 53 | 92 | 1 | 0 | PM2.5 |
| 2018 | 11 | 48 | 117 | 107 | 8 | 3 | PM2.5 |
| 2017 | 9 | 55 | 195 | 99 | 9 | 2 | PM2.5 |
| 2016 | 8 | 24 | 130 | 117 | 2 | 1 | PM2.5 |
| 2015 | 12 | 48 | 172 | 110 | 8 | 2 | PM2.5 |
| 2014 | 11 | 26 | 90 | 111 | 6 | 0 | PM2.5 |
What This Means for Lake County Residents
Lake, Montana has received an Air Quality Grade of B (77/100) 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 2 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.