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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:
David Bizot

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, May 21 - Friday, May 25, 2018


Good and Moderate levels.

Particle pollution (PM2.5)

Good and Moderate levels.

Weather outlook

PM2.5 and ozone air quality are Good across Wisconsin this Monday. High pressure presides over the Midwest as a low pressure center moves off to the southeast, leaving lingering rain showers across the Badger State in its wake. Air quality will remain Good for Monday.

Tuesday and Wednesday will be cool and calm with continued Good air quality as the high pressure system treks eastward.

By Thursday, stagnant conditions give way to light southwesterly winds as temperatures continue to warm. Some Moderate ozone readings are possible, though rain and cloud cover could keep air quality in the Good range.

On Friday, temperatures continue to increase but so do winds, and the threat of precipitation and cloudy skies remains. The chance for Moderate ozone is increased, but could remain Good with sufficient rain and clouds.

Below is the weather map for 7 a.m. on Wednesday.

Weather map for 7 a.m. on Wednesday, May 23.

Weather map for 7 a.m. on Wednesday, May 23. Graphic is courtesy of the National Weather Service.

Extended outlook

The chance for Moderate ozone continues into Saturday with temperatures remaining warm and rain ending, though increasing winds from the west will keep pollution levels at bay. By Sunday, winds take a turn to a northerly direction under the influence of high pressure, and air quality will return to the Good range through Monday.

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 May 21 2018