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). 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.

Wednesday, January 22 - Tuesday, January 28, 2025

Ozone

Good levels.

Particle pollution (PM_2.5)

Good levels.

Short-Term Forecast Maps:

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 AQI is forecast through the short-term period. Steady northwest flow through the short-term will produce temperatures at to below normal for early January, with wind chills dipping into the negatives at times. Currently, overnight Friday into Saturday morning looks to be the coldest period. On a more positive note, decreasing clouds should lead to more sunshine, especially on Friday and Saturday.

Extended Outlook (Days 4-7)

Good AQI is forecast through the extended period. A low-pressure system remains forecast to move out of the southern Plains and into the Tennessee valley on Sunday. Given the current forecast track alongside model trends, it is becoming more likely that the bulk of the precipitation will remain to the south and east of Wisconsin. With that said, winds could become favorable to produce lake effect snow off lake Michigan Sunday PM through Monday AM. Seasonably cool temperatures and northwest flow are then forecast to continue through Wednesday.

Air Quality Index (AQI) ranges

For more information about AQI ranges and colors, see the U.S. EPA's Air Quality Index (AQI) Basics.