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Air Quality Forecast

The Department of Environmental Protection's Bureau of Air Quality established this site to inform the general public of current air quality concentrations 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. Air Quality 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:

Cold Weather Statement for Particle Pollution: 1) At this time of year, clear nights with little or no wind can allow pollutants to be trapped near the ground. If calm conditions persist during the day, Particle Pollution levels will likely remain high long enough for the daily average to be Moderate. Urban areas and Valleys are most prone to these higher levels of pollutants. If you have a heart or lung disease, you will want to check the forecast nearly every day through the winter months. 2) In addition, Moderate levels of coarse particles can occur on windy days or during high traffic times near roadways that have dried out after being heavily sanded.

Today's Forecast: Feb 10, 2010

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: Updated Tuesday, February 9 at 1:11 PM: Wednesday's Air Quality Forecast for Ozone and Particle Pollution is GOOD statewide. [Particle pollution levels could build during the overnight hours but by morning clouds will be moving in and winds picking up. Therefore, the 24hr average will remain in the Good range. Coarse particle levels will likely climb near roadways and parking lots as the winds pick up sand and salt especially in areas that have not received snow in several days.] -- WEBSTER

View today's current data

Tomorrow's Forecast: Feb 11, 2010

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 Tuesday, February 9 at 1:11 PM: Thursday's Air Quality Forecast for Ozone and Particle Pollution is GOOD statewide. [Brisk northerly winds will keep the atmosphere well mixed and particle pollution values should be low. Coarse particle levels could be higher around roadways and parking lots.] -- WEBSTER

Forecast Legend
Air Quality Descriptor Air Quality Index Health Effects
Good 0-50 No Health Notice
Moderate 51-100 Limited Health Notice
Unhealthy for Sensitive Groups 101-150 Health Notice
Unhealthy 151-200 Health Advisory
Very Unhealthy 201-300 Health Alert

View more information about Air Quality Index and Health Effects.

Questions about forecasts or air quality data?
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