Air quality in United States
Air quality in Maine today
Updated
Good: average US AQI 39 across 1 city in Maine Worst now: Portland, ME (39); cleanest: Portland, ME (39).
Live US AQI, PM2.5 and ozone for cities across Maine, compared with the United States average.
- Average US AQI
- 39 Good
- United States average
- 52 619 cities
- Most polluted now
- Portland, ME AQI 39
- Cleanest now
- Portland, ME AQI 39
- Cities above 100
- 0
Air quality in Maine today
Right now the modelled air quality in Maine averages a US AQI of 39 (Good) across the 1 city we track. By category: 1 Good (of 1).
That is 13 points cleaner than the United States average of 52, ranking 12 of 51 states from cleanest to most polluted.
Portland, ME has the worst air at 39 (PM2.5 9.8 µg/m³), and Portland, ME the cleanest at 39. No tracked city is above 100, so no group needs to change plans.
Maine cities by AQI (most polluted first)
| City | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Portland | 39 | Good | 9.8 | 12 | 50 |
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Modelled by CAMS (Copernicus) via Open-Meteo, refreshed twice a day; read hour by hour from the forecast.
Cities in Maine
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Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).