Air Quality Forecast

Air Quality Data

Current and expected air quality concentrations for the upcoming 24 hours. 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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Forecasts on Twitter.

Special status notes:

EPA has unveiled the new AirNow at www.airnow.gov. The new AirNow web site uses your location and will no longer open on the national map. If your device has location information, the new AirNow will open with the forecast and current data* nearest to your location. If your computer does not have location information the web page will allow you to type in your city/town name. Maine DEP Air Quality Meteorologists have worked with EPA to improve the chances that you will be assigned to the correct forecast and data. -------------- *It is important to note that AirNow current data is a Nowcast which means it heavily weights the most recent 3 hours. Since Ozone has an 8-hour average and Particle Pollution has a 24-hour average there will be times that a Nowcast would temporarily show a higher category than the final averages for the day. In the Air Quality Data box near the upper right of the Maine Air Quality Forecast page you can click on Unedited Hourly Data or Historical Data to see current and past data respectively.

Today's Forecast: Sep 19, 2018

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 Legend

Ozone

Map displaying today's Ozone forecast conditions

Particle Pollution

Map displaying today's Particle Pollution forecast conditions

Forecast Details: Issued Tuesday, September 18 at 9:40 AM: Wednesday's Air Quality Forecast for Ozone and Particle Pollution is GOOD statewide. -- Downs

Tomorrow's Forecast: Sep 20, 2018

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 Legend

Ozone

Map displaying tomorrow's Ozone forecast conditions

Particle Pollution

Map displaying tomorrow's Particle Pollution forecast conditions

Forecast Details: Issued Wednesday, September 19 at 1:50 PM: Thursday's Air Quality Forecast for Ozone and Particle Pollution is GOOD statewide. -- Downs

Forecast regions are used to refer to general geographic areas of the state and air pollution obviously is not contained by these boundaries. If a region adjacent to the region containing your particular town is forecasted to have poorer air quality than your region, you might consider noting the health effects associated with the poorer air quality and take appropriate actions.

Forecast Legend
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.

View more information about Air Quality Index and Health Effects.

AirNow is a partnership of federal, tribal, state and local agencies providing air quality data and other resources.

Questions about forecasts or air quality data?
Contact Us, (207) 287-7688