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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, November 20 - Sunday, November 26, 2017

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 levels.

Weather outlook

PM2.5 air quality is in the Good range this Monday morning. Temperatures will warm to the upper 40s Monday as southerly winds develop ahead of an approaching cold front. Skies will be partly sunny and air quality will remain in the Good range.

The cold front should exit eastern Wisconsin Tuesday morning. Northwesterly winds behind the front will usher in a colder air mass for Tuesday and Wednesday.

Quiet weather will continue for Thanksgiving Day. A weak cold front will cross the state with little meaningful weather.

Air quality will be in the Good range throughout the period.

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

Weather map for 6:00 a.m. Wednesday, November 22.

Weather map for 6:00 a.m. Wednesday, November 22. Graphic is courtesy of the National Weather Service.

Extended outlook

Several frontal boundaries and wind shifts will affect Wisconsin on Friday and Saturday as a storm system tracks across southern Canada. A cold air mass and west-northwesterly winds will drop into the region on Saturday and last into Monday. Air quality is expected to be in the Good range next weekend.

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 November 20 2017