Metropolitan Washington
 
Data and Forecasts courtesy of:
 

 
AQI: Good (0 - 50) AQI: Good (0 - 50)
Air quality is considered satisfactory, and air pollution poses little or no risk.
AQI: Moderate (51 - 100) AQI: Moderate (51 - 100)
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy for Sensitive Groups (101 - 150)
Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.
AQI: Unhealthy (151 - 200) AQI: Unhealthy (151 - 200)
Everyone may begin to experience health effects members of sensitive groups may experience more serious health effects.
 AQI:Very Unhealthy (201 - 300) AQI: Very Unhealthy (201 - 300)
Health alert: everyone may experience more serious health effects.
AQI: Hazardous(301 - 500) AQI: Hazardous (301 - 500)
Health warnings of emergency conditions. The entire population is more likely to be affected.
Action DayAction Day
 
Local Air Quality Resources
 
State Air Quality Resources
American Lung Association (ALA) of the District of Columbia
District Department of the Environment
District Dept. of the Environment - Contacts
Metropolitan Washington Council of Governments - Air Quality Forecast and Index
 
Data and Forecasts courtesy of:
Current Conditions
Air Quality Index (AQI)
observed at 20:00 EST
81
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the Hazardous category. Additional information on reducing exposure to extremely high levels of particle pollution is available here.
AQI - Pollutant Details
Ozone 25 Good
Particles (PM10) 24 Good
Particles (PM2.5) 81 Moderate
Air Quality Forecast
Today Tomorrow
Air Quality Index (AQI)
53
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
Air Quality Index (AQI)
57
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
AQI - Pollutant Details
Particles (PM2.5)
53
Moderate
Particles (PM2.5)
57
Moderate
Forecast Discussion: Under the influence of high atmospheric pressure, calm winds overnight and into Thanksgiving Day will generate robust nocturnal surface temperature inversions, resulting in increasing fine particle concentrations. With limited vertical mixing and weak winds on Thursday, daily fine particle concentrations will climb to the Good/Moderate threshold. Similar conditions into Friday will further push regional concentrations into the Moderate AQI range. While a cold front moves through the region during the day on Saturday helping to clear particle pollution by the afternoon, morning concentrations may be quite high across the region resulting in daily average fine particle concentrations remaining in the Moderate AQI range. Increasing winds on Sunday should help bring the region back towards the upper Good AQI range for particle pollution. However, the return to high pressure by early next week will increase fine particle concentrations back towards and/or to the Moderate AQI range. Fine particle concentrations on all days are expected to be highest in the early morning hours due to nocturnal temperature inversions. -MDE
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