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, April 6 - 10:15 a.m.

Monday, April 6 - Thursday, April 12, 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)

Good (Green) AQI is forecast throughout the short-term period. Cold temperatures today (Monday) will be reinforced by blustery, polar air dropping in from the NW, accompanied by spotty snow showers. With winds weakening and skies clearing overnight, seasonably frigid temperatures are expected to be in place by Tuesday morning. Despite a southerly component returning to the flow Tuesday, high temperatures will only manage right around 40-degrees. On Wednesday, low pressure will move from the northern Plains into the upper Great Lakes region. Although a slight increase in PM2.5 concentrations is expected, breezy conditions alongside precipitation will allow Good (Green) AQI to continue.

Extended Outlook (Days 4-7)

Low pressure will be exiting the Great Lakes region Thursday as another system builds in the southern Plains. An associated frontal boundary looks to set up south of the IL/WI border, becoming the focal point of precipitation Thursday and Friday. Southern Wisconsin looks to have the best precipitation chances during this time, before high pressure and clearing skies return later Friday through Saturday. Precipitation chances then return alongside seasonably warm to hot temperatures on Sunday. Good AQI is expected through Saturday, with a slight chance for Moderate AQI PM2.5 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].