Air Quality Index
Ft. Smith, AR 72901
Air Quality
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Hourly Forecast for Ft. Smith, AR 72901
| Time | Conditions | Sky Cover | Chance of Precip. | Heat Index Wind Chill | Wind |
|---|---|---|---|---|---|
| Monday, February 20, 2012 | |||||
| 5 pm |
58° F
| 91% | 14% | 58° F | From SE 15 mph |
| 6 pm |
56° F
| 88% | 14% | 56° F | From SE 14 mph |
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What is 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. (EPA-454K-03-002, August 2003, http://www.airnow.gov/)
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