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 Thursday, September 10 - 9:00 a.m.

Thursday's Forecast (September 10)

Pleasant conditions are expected as high pressure moves into the Great Lakes region. Good (Green) AQI is forecast.

Friday's Forecast (September 11)

High pressure will continue to drift into the eastern Great Lakes while an upper-level disturbance will move in from the west. Southerly winds ahead of the disturbance may lead to some areas of Moderate (Yellow) AQI in southern Wisconsin, but for now, Good (Green) AQI remains forecast statewide.

Saturday’s Forecast Trend (September 12)

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].