All states

Maine Air Quality

Western Mountains is the worst air in Maine right now at an index of 41, which is Good, from fine particles (PM2.5). AirNow carries 8 reporting areas in the state. No air quality alert is in force.

Reporting areas: 8
Worst index now: 41
Alerts in force: 0
Towns under smoke: 0

Fine particles on the map

Forecast fine particulate matter from NOAA’s National Air Quality Forecast Capability over Maine. Open it for the live map, where it pans and zooms.

Open the live map with the particulate forecast

Map layer from NOAA National Air Quality Forecast Capability. Boundaries from the Iowa Environmental Mesonet.

Alerts in force

An Air Quality Alert is issued by the National Weather Service on behalf of a state or local agency when pollution is expected to reach a level that harms health. An Air Stagnation Advisory means the air will not move enough to clear what is already in it.

None are in force in Maine right now. All Maine warnings.

By city, now and the days ahead8

Every AirNow reporting area in Maine: what its monitors measured this hour, and what the state or local agency that forecasts for it expects today and tomorrow. Each area links to the nearest town’s page.

Reporting area	Now	Category now	Today	Tomorrow	Pollutant
Western Mountains	41	Good	Good	Good	PM2.5
Southwest Coast	31	Good	Good	Good	Ozone
High Elevations of Acadia National Park	28	Good	Good	Good	Ozone
Mid-Coast	27	Good	Good	Good	Ozone
Eastern Interior	25	Good	Good	Good	Ozone
Northern	25	Good	Good	Good	PM2.5
Downeast Coast	24	Good	Good	Good	Ozone
Western Interior	22	Good	Good	Good	Ozone

Smoke

NOAA’s analysts have not drawn wildfire smoke over any town in Maine today.

Smoke on the radar over Maine

What this means

The index runs from 0 to 500. Good is 0 to 50, Moderate to 100, Unhealthy for Sensitive Groups to 150, Unhealthy to 200, Very Unhealthy to 300, and Hazardous above that. The figure reported for a place is the highest index among the pollutants measured there, and the pollutant that produced it is named beside it.

What these numbers are. An index beside a monitor’s name is a measurement, published hourly by AirNow and preliminary until the operating agency certifies it. A category for today or tomorrow is a state or local agency forecaster’s own forecast for a reporting area. An hourly index is NOAA’s air quality model on a five-kilometer grid, not a reading from any instrument. Where a town has no monitor within reach, only the model figures appear, and the page says so.

Towns

Air quality for any town in Maine: what is measured nearby, the category forecast for today and tomorrow, and NOAA’s model hour by hour. Largest first.

55 smaller towns

Smaller places have pages too; search for one on the air quality landing page.

Sources

Observations and daily forecasts from AirNow, the US Environmental Protection Agency’s program with NOAA, the National Park Service, NASA, tribal, state and local agencies. Hourly forecasts from NOAA’s National Air Quality Forecast Capability. Smoke analysis from NOAA’s Hazard Mapping System. Alerts from the National Weather Service. Index categories and breakpoints are EPA’s, as revised in 2024.