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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.

Friday, May 26 - Tuesday, May 30, 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 this Friday. A frontal boundary currently sits over Minnesota and Iowa. It will continue across the Midwest, bringing a chance for rain showers Friday afternoon and Saturday. Ozone formation and transport is possible Friday with partly sunny skies in southeast Wisconsin and winds coming from the southeast. Air quality will be a mix of Good and Moderate. Clouds will increase Friday night and Saturday daytime as the front crosses the Badger State. Air quality will be a mix of Good and Moderate, turning to Good later in the day Saturday with a northerly wind shift behind the front.

On Sunday, a secondary low out of the Plains States will near the Midwest, bringing another chance for rain showers. Good air quality will continue. On Memorial Day a strong surface low over Ontario will funnel in cooler air from the northwest. Good air quality will persist.

Below is the weather map for 7 p.m. Saturday.

Weather map for 7:00 p.m. Saturday, May 27, 2017.

Weather map for 7:00 p.m. Saturday, May 27, 2017. Graphic is courtesy of the National Weather Service.

Extended outlook

The Canadian low will stall out into the midweek as high pressure builds behind it. Cool northerly winds and Good air quality will continue for Wisconsin through the work week.

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: Friday May 26 2017