Air Quality Forecast

Air Quality Data

Forecast Notifications

Air Quality Forecasts are scheduled to be updated by 3:00 pm weekdays and other times as necessary. Forecasts are also available on the Bureau's Air Quality Hotline at (800) 223-1196.

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Don't know your forecast region? Select your town from the list below to find out.
Minor Civil Divisions are not included; select a larger town nearby.

Today's Forecast: July 17, 2025

Region Ozone Particle
Northern Good Moderate
Western Mtns Good Moderate
Western Interior Good Moderate
Eastern Interior Good Moderate
Southwest Coast Moderate Moderate
Mid-Coast Good Moderate
Downeast Good Moderate
High Elevation Good Moderate
View Health Effects Legend

Ozone

Map displaying todays's Ozone forecast conditions

Particle Pollution

Map displaying today's Particle Pollution forecast conditions

Forecast Details:

Updated Wednesday, July 16, 2025 @ 2:15 PM: Thursday's Air Quality forecast for Ozone is MODERATE for the Southwest Coast region and GOOD for the remainder of the state while Particle Pollution is MODERATE statewide. [Smoke is expected to continue to impact Maine on Thursday. It should start to clear out later in the day.] -- Farrell

Tomorrow's Forecast: July 18, 2025

Region Ozone Particle
Northern Good Good
Western Mtns Good Good
Western Interior Good Good
Eastern Interior Good Good
Southwest Coast Good Good
Mid-Coast Good Good
Downeast Good Good
High Elevation Good Good
View Health Effects Legend

Ozone

Map displaying tomorrow's Ozone forecast conditions

Particle Pollution

Map displaying tomorrow's Particle Pollution forecast conditions

Forecast Details:

Issued Wednesday, July 16, 2025 @ 2:15 PM: Friday's Air Quality forecast for Ozone and Particle Pollution is GOOD statewide. THIS FORECAST WILL BE UPDATED BY 3 PM THURSDAY. -- Farrell

Air Quality Descriptor Color Code Health Effects
Good GREEN No Health Notice. No health impacts expected in this range. It's a great day to be active outside!
Moderate YELLOW Limited Health Notice. Sensitive people should consider reducing prolonged or heavy exertion. Watch for symptoms such as coughing or shortness of breath. These are signs to take it easy.
Unhealthy for Sensitive Groups ORANGE Health Notice. People with heart or lung disease, the elderly, teenagers and children should reduce prolonged or heavy exertion. It is okay to be active outside, but take more breaks and do less intense activities. Watch for symptoms such as coughing or shortness of breath. Asthmatics should follow their action plans and keep quick relief meds handy. Those with heart disease should watch for palpitations, shortness of breath or unusual fatigue and contact your health provider of necessary.
Unhealthy RED Health Advisory. People with heart or lung disease, the elderly, teenagers and children should avoid prolonged or heavy exertion and consider moving activities indoors or rescheduling. Everyone else should reduce prolonged or heavy exertion. Take more breaks during all outdoor activities.
Very Unhealthy PURPLE Health Alert. People with respiratory or heart disease, the elderly, teenagers and children should avoid any outdoor activity. Move activities indoors or reschedule to a time when air quality is better. Everyone else should avoid prolonged or heavy exertion. Consider moving activities indoors or rescheduling to a time when air quality is better.
Hazardous MAROON Health Alert. People with respiratory or heart disease, the elderly, teenagers and children should avoid any outdoor activity. Move activities indoors or reschedule to a time when air quality is better. Everyone else should avoid prolonged or heavy exertion. Consider moving activities indoors or rescheduling to a time when air quality is better.

AirNow is a partnership of federal, tribal, state and local agencies providing air quality data and other resources where you can find air quality forecasts for any state.

Questions about forecasts or air quality data?
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