MIchigan's air quality will be unhealthy for some groups Friday. Check the air quality index map to see if it's good or bad ...

Thursday: A slight chance of showers and thunderstorms after 2 p.m. Sunny, with a high near 94. Heat index values as high as ...

An air quality alert was issued by the National Weather Service in-Sullivan at 1:52 p.m. on Wednesday, July 23.

The National Weather Service has issued an air quality alert due to heavy wildfire smoke from Canada. According to NWS models ...

As of Tuesday morning, the Air Quality Index in Milwaukee was between 115 to 120, which falls in the "unhealthy for sensitive ...

The EPA's AQI ranges from 0 to 500 and represents the measurement of these five different major pollutants regulated by the Clean Air Act.

AirNow and PurpleAir use the Air Quality Index, or A.Q.I., a measure of air quality from 0 to 500 that is composed of six categories, from “good” to “hazardous.” ...