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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.

Monday, January 14 - Friday, January 18, 2019

Note: Ozone monitoring season ended on October 15, 2018. Ozone forecasts will resume in late April, when the 2019 ozone season begins.

Particle pollution (PM2.5)

Good and Moderate levels.

Weather outlook

Air quality is in the Good to Low-end Moderate range across Wisconsin this Monday morning. Weather conditions are stagnant in the Midwest Monday as a frontal boundary hangs near the states northwestern boundary. Moderate levels of Fine Particulate pollution will hang on Monday.

Be cautious of icy conditions Tuesday morning. Moderate PM2.5 levels could linger into Tuesday, although a low pressure system trekking across southern Canada will stir up some winds in the area, which will help mitigate Particulate pollution.

By Wednesday, the passage of the low pressure system will force the cold front through the state, ushering in clean northerly air and high pressure, and restoring Good air quality.

On Thursday, the high pressure system will make way for a low pressure system nudging its way past the Badger State toward the Ohio Valley. Chilly temperatures and Good air quality will continue.

High pressure will return on Friday as another low moves south of the Badger State. Temperatures will continue to drop across the state. The quick exchange of weather systems will keep the air clean across Wisconsin, maintaining Good air quality.

Weather map for 6 a.m. on Wednesday, January 16, 2019.

Weather map for 6 a.m. on Wednesday, January 16, 2019. Graphic is courtesy of the National Weather Service.

Extended outlook

The cooling trend will make for a chilly weekend, with the chance of snow as the low passes to our south on Saturday, while the high pressure system descends southward. Gusty winds throughout the period mean that the air will be well-mixed, and Good air quality will be the rule.

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 14 2019