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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.

Friday, March 24 - Monday, March 27, 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 and Moderate levels.

Weather outlook

PM2.5 air quality is in the Good range across Wisconsin this Friday morning. Most sites should remain the in Good range while some scattered locations may reach low-end Moderate levels. Clouds will cover the northern part of the state but some sunshine will occur over the south.

A frontal boundary draped across southern Wisconsin this morning will remain in the region for the weekend. It will serve as a focus for rain showers through Sunday. Temperatures will be cool with northeast winds adding a chill.

Air quality will be in the Good range through Monday with the possibility of some scattered sites reaching low-end Moderate levels.

Below is the weather map for 7:00 a.m. Sunday morning.

Weather map for 7:00 a.m. Sunday morning, March 26, 2017.

Weather map for 7:00 a.m. Sunday morning, March 26, 2017. Graphic is courtesy of the National Weather Service.

Extended outlook

A high pressure system should push across the region with quiet and seasonal weather for Tuesday and Wednesday. 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: Friday March 24 2017