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.

Thursday, October 24 - Wednesday, October 30, 2024

Ozone

Good to Moderate levels.

Particle pollution (PM_2.5)

Good to Moderate 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. As high-pressure drifts east today, southerly flow will be accompanied by increasing clouds and precipitation chances as a front moves in from the west. Showers and a few storms will begin over western areas this afternoon and evening, before ending over eastern Wisconsin Friday morning. Breezy northwest flow on Friday will precede a high-pressure air mass, centering itself over the Great Lakes Region on Saturday. Expect mostly sunny skies and near-normal temperatures both days.

Extended Outlook (Days 4-7)

High-pressure to our east and low-pressure to our west will tighten the pressure gradient through the extended period, leading to blustery southerly flow and warming temperatures. A good amount of sun should continue, especially for southern areas, while better chances for clouds and precip. will return to the north beginning Monday. In the Tuesday to Wednesday timeframe, temps will warm to near 80-degrees as the low-pressure system moves into the region, also increasing clouds and precip. chances statewide. While mostly Good AQI is anticipated during this active weather pattern, Moderate AQI cannot be ruled out.

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].