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 23 - 4:40 p.m.

Saturday's Forecast (October 24)

Breezy southerly flow and seasonably warm temperatures will continue ahead of an approaching cold front. Showers and weak storms along the front will then move into northwest Wisconsin through the p.m. hours. Enhanced PM2.5 concentrations look to continue ahead of the front, yielding another statewide Moderate (Yellow) AQI forecast.

Sunday's Forecast (October 25)

Cloud cover with possible showers will continue along the front as it slowly sags south-southeast. Behind the front, Good (Green) AQI is forecast to develop, while Moderate (Yellow) AQI is likely to persist ahead of the front across southern and eastern Wisconsin.

Monday’s Forecast Trend (October 26)

Air quality is expected to improve.

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].