Short for air quality index, AQI is a measurement of the breathable air quality with a value between 0 (zero) and 500. The higher the AQI value, the greater the level of air pollution and concern for health. Microsoft Windows 10 users may notice the AQI listed next to the weather in the Windows notification area, as shown below. In this case, the AQI is 126.
AQI values
Below is an overview of the AQI index values and their description from AirNow.
The weather and AQI are related to the location data saved on your Microsoft account. They are not based on the location of the computer or its temperature.
Windows notification area
