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, September 20 - 6:00 p.m.

Monday's Forecast (September 21)

Northeasterly flow associated with high pressure influence will keep max temperatures seasonably cool in the upper 50s to low 60s. Widespread cloud cover is expected, with precipitation possible to the southwest. Good (Green) AQI is forecast for both ozone and PM2.5.

Tuesday's Forecast (September 22)

Winds from the northeast and cooler temperatures will continue on Tuesday as high pressure remains the primary driver. Despite decreasing cloud cover and increasing sunshine, Good AQI will continue.

Wednesday’s Forecast Trend (September 23)

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].