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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.

Monday, January 23 - Thursday, January 26, 2017

Note: Ozone monitoring season ended on October 15, 2016. Ozone forecasts will resume in late April, when the 2017 ozone season begins.

Particle pollution (PM2.5)

Good levels.

Weather outlook

PM2.5 air quality is in the Good range across Wisconsin this Monday morning. Little change is expected in today's weather with mild and overcast conditions continuing. Air quality will remain in the Good range.

A storm system will approach the state tomorrow with rain and snow likely by evening. Winds will be calm in the morning then become easterly during the day. Air quality should be in the Good range.

The storm system will pass east of Wisconsin during Wednesday. This will allow the winds to shift to the northwest and bring colder air back into the region beginning late Wednesday and lasting through Thursday. Air quality is forecast to be in the Good range for Wednesday and Thursday.

Below is the weather map for 6:00 a.m. Wednesday morning.

Weather map for Wednesday, January 25, 2017.

Weather map for 6:00 a.m. on Wednesday, January 25, 2017. Graphic is courtesy of the National Weather Service.

Extended outlook

More January-like temperatures are forecast for Friday and Saturday with north-northwesterly winds. Air quality will 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: Monday January 23 2017