Department meteorologists use monitoring data and weather forecast models to predict Wisconsin's future ozone (O3) and fine particulate matter (PM2.5) 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 9 - 10:15 a.m.

Monday, March 9 - Sunday, March 15, 2026

Ozone

Good (Green) AQI levels.

Particle pollution (PM2.5)

Good (Green) 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)

Good (Green) AQI is forecast through the short-term forecast period. An active weather pattern will kick off today (Monday) with record high temperatures likely across much of the southern half of the state ahead of a cold front moving in from NNW. Winds will shift from northerly to northeasterly behind the front on Tuesday as high pressure moves across Ontario and low pressure develops over the Plains. As the system moves into the Midwest late Tuesday into Wednesday morning a wintery mix is expected across northern areas while storms are more likely for southern areas. Chances of light snow will then linger on Wednesday as the system exits the Great Lakes region.

Extended Outlook (Days 4-7)

Good AQI is forecast through the extended forecast period. A brief lull is expected early Thursday, but precipitation chances will then increase from west-to-east later Thursday as a fast-moving clipper system moves into the region, bringing a wintery mix with light snow accumulations possible by Friday morning. Another lull is anticipated later Friday into early Saturday before a large system moves into Midwest later Saturday through 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].