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:

IMPORTANT NOTE: As roads and parking lots dry out the sand & salt residue can be stirred up by winds and traffic. Therefore, coarse particle pollution levels could be high nearby and downwind of roads & parking lots.

Today's Forecast: Feb 20, 2019

Region Ozone Particle
Northern Good Good
Western Mtns Good Moderate
Western Interior Good Moderate
Eastern Interior Good Good
Southwest Coast Good Moderate
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: Updated Tuesday February 19 at 1:50 PM: Wednesday's Air Quality Forecast for Ozone is GOOD statewide while Particle Pollution is MODERATE for the Western regions and GOOD for the remainder of the state. [High pressure approaches with lightest winds in the western regions. This will allow particle pollution values to rise. In other areas of the state it will remain breezy overnight so particle pollution levels are not likely to rise. Winds are forecast to be strongest in the north so even with very cold temperatures, likely leading to higher emissions from heating needs, particle pollution levels should remain low.] -- Webster

Tomorrow's Forecast: Feb 21, 2019

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: Updated Wednesday February 20 at 12:54 PM: Thursday's Air Quality Forecast for Ozone and Particle Pollution is GOOD statewide. [High level clouds are already moving into Maine on Wednesday. These clouds will thicken and lower for much of Maine by sunset. This will keep particle pollution levels low overnight. For northern areas clouds take longer to move in and may not amount to much until midnight. So with light winds and not much cloud cover, particle pollution levels might rise a bit. However, I expect that once the storm moves in the air will quickly become well mixed and particle pollution levels will drop. So a 24 hour average higher than good is not likely.] -- Webster

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.

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