Noise monitoring program

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.

Wednesday, July 24 - Tuesday, July 30, 2024


Good to USG levels.

Particle pollution (PM2.5)

Good to USG levels.

Short-Term Forecast Maps:

Forecast AQI maps for the short-term forecast period.

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)

Weak low-pressure is moving east over the Great Lakes region and will be replaced by high-pressure dropping south from Ontario on Wednesday. Temperatures will be at to slightly below normal alongside light northerly winds and decreasing clouds. Similar conditions are forecast Thursday as the high-pressure center moves overhead. Mostly sunny skies and slightly warmer temperatures will kick-off a warming trend which currently looks to last through the weekend. Statewide Good AQI ozone and PM2.5 are forecast for Wednesday and Thursday, although there is a slight chance for Low-Moderate AQI PM2.5 near the Mississippi River valley from lingering wildfire smoke impacts. High-pressure will continue to slide east on Friday, with a southerly component to the flow alongside mostly sunny skies leading to another bump in temperatures. We’ll maintain a statewide Good AQI PM2.5 forecast, but chances for Low-Moderate AQI PM2.5 remain possible in far western areas. Although mostly Good AQI ozone is forecast, the shift to southerly flow will mean Moderate AQI ozone potential across south-central and southeast Wisconsin.

Extended Outlook (Days 4-7)

We should observe one more dry day on Saturday alongside southerly winds, increasing temperatures, and a mix of Good to Moderate AQI ozone and PM2.5. Beginning Sunday, models suggest a more active pattern approaching from the south and west. Precipitation chances should begin increasing Sunday, although Monday into early Tuesday currently looks like the best chance for widespread showers/storms. A mix of Good to Moderate AQI is currently expected for most Sunday through Tuesday. However, we’ll have to monitor USG AQI ozone potential on Sunday and Monday due to southerly flow and hot temperatures. Then, we’ll monitor Tuesday for USG AQI PM2.5 potential, as smoke from wildfires to our north and west may move in behind the departing precipitation.

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].