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 frequently, and when warranted, an Air Quality Advisory is issued. Below is the latest air quality forecast for Wisconsin.

Updated Thursday, September 3 - 4:45 p.m.

Friday's Forecast (September 4)

Hot and humid conditions will continue with potentially strong to severe storms moving through during the early a.m. hours. We’ll continue the statewide Good (Green) AQI forecast for now, but chances for Moderate (Yellow) AQI PM2.5 because of high dew points or Moderate (Yellow) AQI ozone in south central to southeast Wisconsin because of southerly flow remain possible.

Saturday's Forecast (September 5)

A Canadian high pressure air mass will move in from the northeast, and although temperatures and dew points will moderate some, both parameters will remain above average. Good (Green) AQI should continue for most with the best chance to reach Moderate (Yellow) AQI across western areas.

Sunday’s Forecast Trend (September 6)

Air quality is expected to remain satisfactory.

Forecast Maps:

The black dots represent the approximate location of Wisconsin's air quality monitors. The black borders approximate Wisconsin's Reporting Area boundaries on EPA's AirNow website [exit DNR].

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].