2022 Wisconsin Air Quality Trends Report

Wisconsin’s air quality continues to improve and concentrations of most pollutants regulated under the Clean Air Act have been decreasing across the state since monitoring began. All of Wisconsin meets federal standards for every criteria pollutant except ozone, where three nonattainment areas remain along the Lake Michigan shoreline.

The maps below allow the user to navigate through 20 years of criteria pollutant design values to visualize air quality trends in Wisconsin.

Press the play button located near the bottom of each map to begin the animation. Clicking on counties that contain monitoring stations will bring up a time-series graph that spans the entire animation for each site within that county (right click to enlarge the image by opening it in a new tab).