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 12 - 10:45 AM

Thursday, February 12 - Wednesday, February 18, 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)

As high pressure influence continues over Wisconsin, temperatures will slowly warm over the next few days, with daytime highs reaching into the 40s by tomorrow. Wind speeds will remain on the lighter side with variable wind direction expected. A mix of Good (Green) and Moderate (Yellow) AQI for PM2.5 is anticipated today, with locations farther to the north more likely to remain in the Good AQI range. Above freezing temperatures coupled with dewpoints in the 30s will encourage secondary formation of PM2.5 tomorrow and Saturday. As a result, Moderate AQI is more likely statewide through the rest of the short-term forecast period.

Extended Outlook (Days 4-7)

A moderately active meteorological pattern is anticipated through the extended outlook. Long range guidance suggests simultaneous influence from two different low pressure systems on Sunday, with one system moving across the southeastern U.S. and the other passing north of Wisconsin over southern Ontario. PM2.5 concentrations are expected to decrease on Sunday as a weak cold front associated with the northern low pressure system moves through Wisconsin – a mix of Good and Moderate AQI is forecast. Southerly flow and warmer temperatures will return to Wisconsin early next week as the next low pressure system forms in the Great Plains and tracks east towards the Midwest. A mix of Good and Moderate AQI for PM2.5 is forecast to continue through the extended outlook.

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].