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.

Monday, April 15 - Sunday, April 21, 2024


Good levels.

Particle pollution (PM2.5)

Good to Moderate 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)

Sunny skies and temperatures in the upper 60s to low 70s are in store for Wisconsin again today. As a developing low pressure system approaches from the west, weak northerly winds over the state will pivot to easterly by this evening. Wind speeds will increase tomorrow morning ahead of a line of the thunderstorms forecast to impact Wisconsin late tomorrow afternoon through tomorrow evening. By Wednesday morning, the low pressure center will be over Wisconsin, resulting in residual showers, cloud cover, and variable wind directions. As the low pressure center continues eastward, winds will shift to northwesterly, dropping temperatures back to more seasonable values in the 40s by Wednesday night. Overall, the active meteorological pattern will allow for Good AQI for both ozone and PM2.5 throughout the short term forecast period.

Extended Outlook (Days 4-7)

A cooling trend is in store for the remainder of the week, as northwesterly winds behind the exiting low are expected to transport chilled Canadian air into the Midwest. Highs in the 50s are anticipated for Thursday, with peak temperatures in the 40s more likely for Friday through the weekend. Overnight lows may dip into the 30s, increasing the chances for Low-Moderate AQI for PM2.5. However, non-stagnant conditions should aid in low level mixing during these periods. Good AQI is forecast for the extended outlook.

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].