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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.

Thursday, July 20 - Sunday, July 23, 2017


Good levels.

Particle pollution (PM2.5)

Good levels.

Weather outlook

PM2.5 and ozone values are in the Good air quality range this Thursday morning. High pressure will build into the region today bringing some clearing skies. Most areas will see warm and humid conditions with westerly to northwesterly winds. Air quality will remain in the Good range Thursday.

A frontal boundary will remain stalled over southern Wisconsin or northern Illinois through the weekend. This boundary will serve as a focus for numerous showers and thunderstorms. Warm and humid conditions will continue. Due to the expected cloud cover and rain chances most areas should have Good air quality over the weekend.

Saturday would appear to be the best day to see any Moderate levels of ozone and that would only occur at lakeshore locations and only if there would be a prolonged period of sunshine.

Below is the weather map for 7:00 a.m. Saturday morning.

Weather map for 7:00 a.m. Saturday, July 22.

Weather map for 7:00 a.m. Saturday, July 22. Graphics is courtesy of the National Weather Service.

Extended outlook

A cold front is expected to pass through Wisconsin on Sunday. This would bring cooler and drier air to the region for Monday and Tuesday. Air quality would 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: Thursday July 20 2017