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.

AirNow mobile app AIRNow Mobile App This EPA mobile application provides real-time air quality information that you can use to protect your health when planning your day.

EnviroFlash Subscribe to receive emails when the air quality is forecast to reach the AQI level you select.

Forecasts on Twitter.

Special status notes:

IMPORTANT WINTER WEATHER NOTES: 1) Particle pollution forecasts are for the smaller particles. Particle pollution levels tend to climb on cold, calm, clear nights due to nighttime inversions which act like a cap trapping pollution close to the surface. In river valleys and areas with more emissions, especially from wood smoke, levels can reach the moderate range. 2) Coarse particle pollution is also a concern during the winter months. Sand and salt mixtures dry out after a storm. Winds and traffic can stir up coarse particle pollution on roadways and parking lots.

Today's Forecast: Nov 28, 2014

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

Ozone

Map displaying today's Ozone forecast conditions

Particle Pollution

Map displaying today's Particle Pollution forecast conditions

Forecast Details: REVISED Friday, November 29, at 7:46 AM: Friday's Air Quality forecast for Ozone is GOOD statewide while Particle Pollution is MODERATE statewide. [Particle pollution levels are low this morning. After sunset these levels will begin to rise. In some locations particle pollution levels will rise high enough early enough to push today's 24 hr average into the moderate range. Many factors will factor into how fast levels rise these include: how light the winds become, local emissions including wood smoke and whether you are in a valley or not.] -- Forecaster: Webster

View today's current data

Tomorrow's Forecast: Nov 29, 2014

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

Ozone

Map displaying tomorrow's Ozone forecast conditions

Particle Pollution

Map displaying tomorrow's Particle Pollution forecast conditions

Forecast Details: Issued Wednesday, November 26, at 12:26 PM: Saturday's Air Quality forecast for Ozone is GOOD statewide while Particle Pollution is MODERATE statewide. -- Forecaster: Webster

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 relieve 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.

Questions about forecasts or air quality data?
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