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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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Special status notes:

Cold Weather Statement for Particle Pollution: 1) At this time of year clear nights with little or no wind can allow capping of pollutants near the ground (called a nocturnal inversion). If there is also little vertical mixing during the day Particle Pollution levels will likely remain high long enough that the average for the day is 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) Coarse particles are a problem during high traffic times near roadways that have dried out after being heavily sanded.

Today's Forecast: Nov 22, 2009

Region Ozone Particle
Northern Good Good
Western Mtns Good Moderate
Western Interior Good Moderate
Eastern Interior Good Moderate
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 Sunday, November 22 at 6:45 AM: Sunday's Air Quality Forecast for Ozone is GOOD statewide while Particle Pollution is MODERATE for the Western Mountain and both Interior regions and GOOD for all Coastal and Northern regions. [Particle pollution levels are already elevated in the interior and Southwest Coastal regions. Winds will pick up during the day for the Northern and Coastal areas so I expect those regions to end up near the top of the GOOD range by the end of the day. For the interior regions and the mountains winds are not expected to be as strong so with the High pressure reducing vertical mixing most of these areas are likely to be at or near the MODERATE range by the end of the day.] -- WEBSTER

View today's current data

Tomorrow's Forecast: Nov 23, 2009

Region Ozone Particle
Northern Good Good
Western Mtns Good Moderate
Western Interior Good Moderate
Eastern Interior Good Moderate
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 Sunday, November 22 at 6:45 AM: Monday's Air Quality Forecast for Ozone is GOOD statewide while Particle Pollution is MODERATE for the Western Mountain and both Interior regions and GOOD for all Coastal and Northern regions. [Particle pollution levels are expected to rise overnight. Winds will pick up during the day for the Northern and Coastal areas so I expect those regions to end up near the top of the GOOD range by the end of the day. For the interior regions and the mountains winds are not expected to be as strong so with the High pressure reducing vertical mixing most of these areas are likely to be at or near the MODERATE range by the end of the day.] -- 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.

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