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 Sunday, July 5 - 3:55 p.m.

Monday's Forecast (July 6)

Light but favorable flow out of the northeast will continue alongside mostly sunny skies and near normal temperatures. Good (Green) AQI is forecast.

Tuesday's Forecast (July 7)

Conditions will remain pleasant and mostly sunny, with weaker winds and less dispersion leading to higher ozone concentrations. Moderate (Yellow) AQI ozone will be possible across eastern and southcentral areas, as well as downwind of the Twin Cities.

Wednesday’s Forecast Trend (July 8)

Air quality is expected to degrade, especially within the lake breeze along Lake Michigan where Air Quality Advisory criteria may be met for ozone.

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].