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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]. For more information about the AQI and the federal ozone standard, see Wisconsin Statewide Air Quality Notices.

Friday, March 15 - Monday, March 18, 2019


Good levels.

Particle pollution (PM2.5)

Good and Moderate levels.

Weather outlook

High pressure remains in control Monday night with light W-NW winds. On Tuesday, temperatures will warm into the upper 40s to near 50 as increasing southerly winds bring warmer air into the region. The air quality should remain mostly moderate.

A weak trough accompanied by frontal boundary will pass through the area late Tuesday night into early Wednesday morning. Little to no precipitation is expected with this frontal passage as the winds shift to the W-NW and strengthen. Air quality will start in the moderate range and gradually improve with the passage of the frontal boundary.

On Thursday, a high will build into the region from the west keeping the winds westerly gradually becoming northerly as the high moves eastward. The air quality will become a mixture of good to low moderate.

On Friday, as the high shifts eastward the winds will become light eventually becoming southerly on Saturday morning as the high leaves the region. The air quality will be in the good/low moderate range for most of the day slowly degrading to solid moderate as the wind becomes more southerly and very light.

Little to no precipitation is expected through Friday.

Weather map for 7 a.m. on Monday, March 18 2019.

Weather map for 7 a.m. on Monday, March 18, 2019. Graphic is courtesy of the National Weather Service.

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 March 18 2019