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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.

Friday, February 16 - Monday, February 19, 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 Good and Moderate across Wisconsin this Friday. A high pressure system currently situated over Nebraska is ushering clean cold northerly air into the Midwest. Good air quality will continue through Friday.

Beginning Saturday, the approach of a cold front associated with a Canadian low pressure system will bring warmer southerly winds to the Badger State along with the chance for rain and snow tomorrow and Sunday. Air quality will be a mix of Good and Moderate.

By Monday, another strong low pressure system will approach from the southwest, bringing more snow to our region. Dependent on the positioning of the low, Moderate PM values could continue through the day on Monday.

Below is the weather map for 6 a.m. on Sunday.

Weather map for 6 a.m. Sunday, February 18.

Weather map for 6 a.m. Sunday, February 18. Graphic is courtesy of the National Weather Service.

Extended outlook

As the low moves past us on Tuesday, winds will become more northerly, temperatures will cool and air quality will return to the Good range. Good air quality will continue through the middle of the week as high pressure returns to the Midwest.

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: Friday February 16 2018