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.

Monday, February 6 - Sunday, February 12, 2023

Ozone

Good levels.

Particle pollution (PM_2.5)

Good to Moderate levels.

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.

Short-Term Forecast (Days 1-3)

Some AM sunshine will give way to increasing clouds today as a front moves in from the west. PM2.5 concentrations remain elevated this morning in southern and western areas, where Moderate AQI is forecast, while those to the north and northeast will have a better chance to see Good AQI on the day. As the front pushes through this afternoon into early Tuesday morning mixed precipitation will impact the state, with light snow accumulations for northern areas and a better chance to see all rain further southeast. Winds will turn westerly behind the front as skies begin to clear from west-to-east alongside a transition to statewide Good AQI PM2.5 concentrations. Overall, Wednesday is shaping up to be rather nice and warm as winds turn southerly and clouds increase from south-to-north as the next system approaches. Although PM2.5 concentrations are likely to increase some, most areas should remain in Good AQI with the best chance for Moderate AQI in the south and east.

Extended Outlook (Days 4-7)

Exact timing and track of this incoming system will continue to be honed as we move into mid-week, but as it stands now, the main bands of precipitation look to begin late Wednesday and continue through Thursday, while light, remnant precipitation could continue through Friday. Where snow accumulates will depend on the track, with significant accumulations possible to the northwest of the track, while warmer temperatures leading to liquid precipitation southeast of the track will create a sharp cutoff in snowfall amounts. Good to Moderate AQI PM2.5 will continue Thursday, but as the system moves through, a trend towards Good AQI will be underway for Friday and Saturday. By Sunday, chances for Moderate AQI will return as winds weaken and turn southerly.

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].