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September 17, 2014
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Home > Environment > Air Quality > Forecast

Metropolitan Washington Area Forecast

Air Quality Forecast


Yesterday's Air Quality Index Report and Historical Data 
Detailed air quality data for the Washington, DC Metropolitan area can also be found on the EPA AIRNOW web site.



Air Quality Index (AQI) Scale
AQI Range
AQI Category
AQI Colors
0 - 50
Good
green
51 - 100
Moderate
yellow
101 - 150
Unhealthy for
Sensitive Groups
orange
151 - 200
Unhealthy
red
201 - 300
Very Unhealthy
purple
What is
Air Quality Index (AQI)?

The AQI is an index for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health concerns you should be aware of. The AQI focuses on health effects that can happen within a few hours or days after breathing polluted air. EPA uses the AQI for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide. For each of these pollutants, EPA has established national air quality standards to protect against harmful health. For more information on the Air Quality Index, view EPA's AQI Brochure.

Air Quality Hotline: (202) 589-1212


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