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 two-to-three times weekly throughout the year, and when warranted, an Air Quality Advisory is issued. Below is the latest air quality forecast for Wisconsin.

Updated Thursday, February 26 - 10:02 AM

Thursday, February 26 - Wednesday, March 4, 2026

Ozone

Good (Green) AQI levels.

Particle pollution (PM_2.5)

Good (Green) to Moderate (Yellow) AQI levels.

Short-Term Forecast Maps:

Forecast AQI maps for the short-term forecast period.

The black dots represent the approximate location of Wisconsin's air quality monitors. Read the forecast summaries below for further geographic information.

Short-Term Forecast (Days 1-3)

Cold temperatures this (Thursday) morning will give way to warming as southwesterly flow takes hold, allowing PM2.5 concentrations to end up in the Moderate (Yellow) AQI category for most areas by the end of the day. Moderate (Yellow) AQI PM2.5 will continue for most Friday morning, but gusty winds aiding in dispersion and an eventual frontal passage will cause PM2.5 concentrations to trend towards Good (Green) AQI through the PM hours of Friday. Weakening northerly flow, cool temperatures, and Good (Green) AQI are forecast Saturday.

Extended Outlook (Days 4-7)

Although Good AQI is likely to continue Sunday, weakening winds with periods of stagnation could lead to Moderate AQI PM2.5 concentrations as early as Monday and continuing through the extended period.

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].