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 Friday, July 24 - 4:05 p.m.

Saturday's Forecast (July 25)

Southwest flow early will turn more westerly throughout the day with an increase in temperatures and humidity expected. Smoke from wildfires in Oregon, Washington, Idaho, and British Columbia will be working its way across the northern Plains and may begin impacting western and northern Wisconsin, with Moderate (Yellow) AQI PM2.5 possible. Moderate (Yellow) AQI ozone will also be possible within the lake breeze and downwind of the Twin Cities.

Sunday's Forecast (July 26)

Continuing SW flow allows heat and humidity to spread before increasing storm chances arrive through the PM hours. Light wildfire smoke impacts will be possible statewide, leading to a Moderate (Yellow) AQI PM2.5 forecast. Ozone may reach the Moderate (Yellow) AQI category within the lake breeze if it is able to push inland.

Monday’s Forecast Trend (July 27)

Air quality is expected to remain satisfactory, although slightly degraded by wildfire smoke.

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].