Aroostook, Maine Air Quality
Aroostook County, Maine (ME)
↓ 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 | 37 | 59 | 142 | 277 | 85 | 3 | PM2.5 |
| 2022 | 34 | 54 | 80 | 304 | 60 | 0 | PM2.5 |
| 2021 | 35 | 54 | 182 | 305 | 58 | 2 | Ozone |
| 2020 | 36 | 53 | 205 | 316 | 49 | 1 | Ozone |
| 2019 | 36 | 55 | 182 | 304 | 59 | 2 | Ozone |
| 2018 | 42 | 60 | 216 | 262 | 101 | 2 | PM2.5 |
| 2017 | 40 | 58 | 120 | 257 | 107 | 1 | PM2.5 |
| 2016 | 39 | 57 | 169 | 265 | 100 | 1 | PM2.5 |
| 2015 | 44 | 64 | 97 | 226 | 139 | 0 | PM2.5 |
| 2014 | 44 | 65 | 117 | 221 | 143 | 1 | PM2.5 |
What This Means for Aroostook County Residents
Aroostook, Maine has received an Air Quality Grade of B (74/100) based on a decade of EPA monitoring data. The current median AQI of 37 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 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.