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 Monday, March 23 - 10:55 a.m.

Monday, March 23 - Sunday, March 29, 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)

A warming trend is in store for Wisconsin over the next few days. As a high pressure system moves through the region today, temperatures will reach the low to mid 40s with northerly winds shifting to southerly by this evening. Good (Green) AQI for PM2.5 is expected. Southerly flow tomorrow and Wednesday will promote continued warming, with temperatures reaching the low to mid 50s tomorrow and mid to upper 50s by Wednesday. Winds near the surface will encourage mixing, however, southerly flow may bring some light smoke from widespread burning across the southeastern U.S. and Flint Hills area into the region. A mix of Good and Moderate (Yellow) AQI for PM2.5 is forecast for Tuesday, with increased chances for more widespread Moderate AQI for PM2.5 on Wednesday.

Extended Outlook (Days 4-7)

A low pressure system is currently expected to pass through the Midwest on Thursday. Winds over Wisconsin will shift to northerly behind the associated cold front and temperatures will significantly decrease as a new airmass enters the Midwest from Canada. Pending the timing and placement of the low pressure center, counties in southern Wisconsin may see Moderate AQI for PM2.5 ahead of the cold front. Locations farther north have higher chances for remaining in the Good AQI range. Good AQI is then forecast statewide Friday and Saturday, with chances for Moderate AQI returning on Sunday.

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].