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today's forecasts on AIRNow [exit DNR].
current air quality in Wisconsin.
and subscribe to air quality notices.
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, April 24 - Friday, April 28, 2017


Good and Moderate levels.

Particle pollution (PM2.5)

Good and Moderate levels.

Weather outlook

PM2.5 and ozone air quality are Good across Wisconsin Monday morning. A low pressure system currently situated over South Dakota and associated frontal boundary will cross Wisconsin Tuesday and Wednesday, bringing a chance for rain both days. A mix of Good and Moderate air quality is in store for Tuesday, returning to Good levels on Wednesday.

Rain will continue Thursday in the wake of the low, and Good air quality will remain. Air quality will be mostly Good on Friday with some low Moderate readings possible, as winds shift to an easterly direction ahead of a low pressure trough centered near the Texas panhandle.

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

Weather map for 7 p.m. Wednesday, April 26, 2017.

Weather map for 7 a.m. Wednesday, April 26, 2017. Graphic is courtesy of the National Weather Service.

Extended outlook

Moderate air quality remains a possibility on Saturday with prolonged easterly winds as storms associated with the trough make their way into the Midwest. By Sunday, periods of rain will return us to the Good range. Rain will continue into Monday as the low finally reaches us, and Good air quality will persist.

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 April 24 2017