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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, July 25 - Sunday, July 31, 2016


A mix of Good and Moderate levels this week.

Particle pollution (PM2.5)

A mix of Good and Moderate levels this week.

Weather outlook

Ozone and PM2.5 air quality are in the Good range across Wisconsin this Monday morning. High pressure building into the region will result in light northwest winds, slightly lower humidity and continued Good air quality for Monday.

On Tuesday the high pressure system drifts east and a frontal boundary will move into northern Wisconsin. It should be another warm day. Air quality should generally remain in the Good range with possible Moderates along the Lake Michigan shore.

The front will sag into southern Wisconsin on Wednesday. Meanwhile, an area of low pressure will head toward the region. These features will combine to bring increasing chances of clouds and rain for Wednesday and Thursday. Good air quality should prevail through Thursday. Moderate air quality is possible at lake shore sites on Wednesday.

Slightly cooler air should move into Wisconsin for Friday and Saturday. Air quality will remain in the Good range.

Southerly winds and warmer temperatures will return for Sunday and Monday. These conditions will be more favorable for Moderate air quality levels.

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 July 25 2016