Department meteorologists use monitoring data and weather forecast models to predict Wisconsin's future ozone (O3) and fine particulate matter (PM2.5) 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.
Friday, September 29 - Thursday, October 5, 2023
Good to Moderate levels.
Particle pollution (PM2.5)
Short-Term Forecast Maps:
The daily AQI is forecast for counties that monitor each pollutant of interest. The black dots represent the approximate location of Wisconsin's air quality monitors. Read the forecast summaries below for further geographic information.
Extended Outlook (Days 4-7)By Monday, a large upper level disturbance will be moving through the western U.S. High pressure will remain the dominate driver over Wisconsin, with southerly winds and high temperatures in the 80s. Good to Moderate AQI for ozone is expected to persist, with PM2.5 likely to remain in the Good AQI range. As the upper level wave approaches the Midwest, an associated low pressure system will develop at the surface. Current long-range guidance suggests the cold front from this system will impact Wisconsin Wednesday afternoon into Wednesday evening. Elevated ozone may be observed ahead of the cold front, so timing of frontal passage will likely impact peak pollutant concentrations. For now, Moderate AQI for ozone is forecast for eastern Wisconsin, with Good AQI more likely for counties farther west. On Thursday, northerly winds and a clean airmass will bring a significant temperature drop and Good AQI statewide for both ozone and PM2.5.
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].