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today's forecasts on AIRNow [exit DNR].
current air quality in Wisconsin.
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Contact information
For information on air quality and forecasts, contact:
Mike Majewski

Current air quality outlook

Department meteorologists use monitoring data along with weather predictions to determine when and where an air quality notice is needed. The meteorologists submit daily air quality forecasts for eight Wisconsin cities to EPA's AirNow website [exit DNR]. Below is the current air quality forecast for Wisconsin, which will be updated as needed.

Forecasts are reported using the Air Quality Index (AQI) [exit DNR]. The AQI has recently changed to reflect the new federal ozone standard. See Wisconsin Statewide Air Quality Notices for details.

Monday, August 22 - Tuesday, August 23, 2016

Particle pollution (PM2.5)

Good air quality.


A mix of Good and Moderate air quality.

Weather outlook

Ozone and PM2.5 air quality are in the Good range across Wisconsin this Monday morning. A high pressure system will drift into the eastern Great lakes region today. This will provide the region with mild temperatures, light southerly winds and sunshine. Air quality should remain in the Good range.

Stronger southerly winds, warmer temperatures and continued sunshine are expected on Tuesday. A lake breeze is possible along the Lake Michigan shoreline. This scenario will provide favorable conditions for some elevated ozone concentrations over eastern Wisconsin. Graphical output from the Canadian model provides a good depiction of the areal coverage (see below) of the ozone plume. The latest run of the U.S. ozone model is predicting lower concentrations for Tuesday. The current forecast is for Moderate levels of ozone over eastern Wisconsin on Tuesday. This forecast will be updated as later data becomes available.

Image showing areal coverage for August 22-23, 2016

Extended outlook: A cold front will cross Wisconsin on Wednesday bringing chances of clouds and rain. Winds will turn northwesterly behind the front as high pressure moves in late Wednesday and Thursday. Air quality will be in the Good range.

Air Quality Index (AQI) ranges

For more information, see the U.S. EPA's Air Quality Index - A Guide to Air Quality and Your Health [exit DNR].

Color coded chart showing ozone and PM2.5 concentration ranges for each AQI level
AQI Levels
of Health Concern
Numerical Value 8-hr Ozone (ppb) 24-hr PM2.5 (ug/m3)
Good 0-50 0-54 0.0 to 12.0
Moderate 51-100 55-70 12.1 to 35.4
Unhealthy for Sensitive Groups 101-150 71-85 35.5 to 55.4
Unhealthy 151-200 86-105 55.5 to 140.4
Very Unhealthy 201-300 106-200 140.5 to 210.4
Hazardous > 300 > 201 > 210.4
Last revised: Monday August 22 2016