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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]. The AQI has recently changed to reflect the new federal ozone standard. See Wisconsin Statewide Air Quality Notices for details.

Monday, January 22 - Friday, January 26, 2018

Note: Ozone monitoring season ended on October 15, 2017. Ozone forecasts will resume in late April, when the 2018 ozone season begins.

Particle pollution (PM2.5)

Good and Moderate levels.

Weather outlook

PM2.5 air quality is currently in the Good range across Wisconsin this Monday. Monday's rain will change to snow Monday night into Tuesday as a cold front crosses the state, setting the stage for colder temperatures and continued Good air quality through the middle of the week. The cold front will depart tomorrow and high pressure will build into the Midwest Wednesday as Good air quality persists.

Temperatures will warm on Thursday with a southerly wind as a low pressure system approaches, melting any snow accumulation. Moderate PM levels are possible across the Badger State. Moderate air quality could continue on Friday, but will be hindered by strong gusty winds with the arrival of the low pressure system.

Below is the weather map for midnight Tuesday.

Weather map for  midnight Tuesday, January 23.

Weather map for midnight Tuesday, January 23. Graphic is courtesy of the National Weather Service.

Extended outlook

Gusty west winds are in store on Saturday as the low pressure center passes to our north, changing to northerly winds on Sunday in the wake of the low. High pressure and a cold northerly air mass builds into the Midwest on Monday. Air quality will be mostly Good through the weekend and into Monday.

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 January 22 2018