Department meteorologists use monitoring data and weather forecast models to predict Wisconsin's future ozone (O₃) and fine particulate matter (PM_2.5) air quality using the Air Quality Index (AQI) [exit DNR]. This forecast is updated frequently, and when warranted, an Air Quality Advisory is issued. Below is the latest air quality forecast for Wisconsin.

Updated Friday, October 2 - 4:13 p.m.

Saturday's Forecast (October 3)

High pressure will move from the Great Lakes to New England as a low pressure system moves into the Upper Great Lakes. Precipitation chances will increase through the p.m. hours for northern Wisconsin, with the potential for a few rumbles of thunder as the front moves through. Good (Green) AQI is forecast.

Sunday's Forecast (October 4)

The front will continue to move through the state early, potentially bringing light showers before steady northwest winds bring in another shot of crisp, fall air. Good (Green) AQI is forecast to continue.

Monday’s Forecast Trend (October 5)

Air quality is expected to remain satisfactory.

Forecast Maps:

The black dots represent the approximate location of Wisconsin's air quality monitors. The black borders approximate Wisconsin's Reporting Area boundaries on EPA's AirNow website [exit DNR].

Air Quality Index (AQI) ranges

For more information about AQI ranges and colors, see the U.S. EPA's Air Quality Index (AQI) Basics [exit DNR].