AQI 30 · PM2.5 · Trend: Stable
| Average AQI | 30 |
| Good Days / Year | 310 |
| Unhealthy Days / Year | 2 |
| Primary Pollutant | PM2.5 |
| PM2.5 Average | 5.2 µg/m³ |
| Trend | → Stable |
| Monitoring Stations | 12 |
| Nonattainment Areas | 0 |
Maine has some of the cleanest air in the eastern US, thanks to its remote location, low population density, and prevailing winds from the Atlantic. Paper mill closures have further improved air quality in recent years.
Maine DEP Bureau of Air Quality manages standards. Member of RGGI. Adopts California vehicle emission standards.
No nonattainment areas. Maine has among the cleanest air in the eastern United States.