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, January 22 - 9:28 AM

Thursday, January 22 - Wednesday, January 28, 2026

Ozone

Good (Green) AQI levels.

Particle pollution (PM_2.5)

Good (Green) to Moderate (Yellow) AQI 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 (Green) AQI is forecast through the short-term period. The coldest air of the winter season is on its way, with wind chills dropping into dangerously frigid territory, ranging from 30 (south) to 50 (north) degrees below zero later today through the AM hours of Friday. Although remaining very cold, wind chills will begin to moderate later Friday through Saturday as the high pressure center drifts overhead and winds weaken.

Extended Outlook (Days 4-7)

Below normal temperatures look to stick around through much of the extended period as another Arctic air mass drops into the south-central U.S. Sunday into Monday. Northwest flow will then return Tuesday into Wednesday, reinforcing the cold conditions. Good to Moderate AQI is forecast.

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].