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, December 5 - Sunday, December 11, 2022

Ozone

Good levels.

Particle pollution (PM_2.5)

Good to USG 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 light snow with freezing rain at times will work through the central part of the state today ahead of a cold front. PM2.5 concentrations will hover right around the Good-to-Moderate AQI cutoff leading to the potential for Low-Moderate AQI on the day, especially in eastern and southeastern areas ahead of the cold front. Otherwise, Good AQI is forecast. Late Monday into early Tuesday will start with a favorable northerly flow, but eventually winds will become weak and disorganized with some precipitation possible in the southern part of the state. PM2.5 concentrations should remain relatively low behind the cold front for the first half of the day, but as temperatures begin to rise above freezing and a relatively moist air mass moves in, these concentrations will be on the rise. Ultimately, Good AQI is forecast Tuesday with the best chance to see Low-Moderate AQI in the southeast. On Wednesday, a cold front will be struggling to drop in from the north as high temperatures reach the low-40s near the IL border but struggle to reach 20 in the far north. Moderate AQI PM2.5 is forecast across much of the state except for the far north where Good AQI remains likely.

Extended Outlook (Days 4-7)

We’ll need to watch how PM2.5 concentrations trend through the day on Wednesday as they are likely to remain elevated on Thursday as well. It remains possible that USG AQI PM2.5 could be in play on Thursday, with the best chance in urban areas. Late Thursday through Friday a system will move through the region, but it’s too early to tell how the precipitation will trend. As it stands now, only southern areas look to see any precipitation, with snow not out of the question. Dry and mild conditions then look to take hold over the weekend, with a mix of Good to Moderate AQI 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].