The Air Quality Index, or AQI, is an air quality alert system maintained by the U.S. Environmental Protection Agency (EPA).
The National Weather Service has issued several air quality alerts for parts of the Midwest including Chicago and the surrounding suburbs as unhealthy smoke from Canadian wildfires continues to move ...
Smog from wildfires sweeping the nation has left tens of millions more Americans to breathe toxic air even as man-made forms of pollution fall, according to a new study released Wednesday. The ...
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