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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.

Friday, August 17 - Tuesday, August 21, 2018


Good and Moderate levels.

Particle pollution (PM2.5)

Good and Moderate levels.

Weather outlook

Ozone air quality is Good in Wisconsin on this rainy Friday morning. PM2.5 air quality has been Moderate across the state all week long, but is returning to Good Friday morning. As the low pressure system off the southern lakeshore brings continued showers Friday followed by an influx of clean air from the north, air quality will remain Good.

A cold front will push through the Badger State from the north Saturday as the low departs to the east. Morning fog will give way to mostly sunny skies, with seasonable temperatures and light variable winds. Air quality will be mostly Good but some sites could see Moderate ozone or fine particulate levels for a portion of the day on Saturday.

Conditions will be similar on Sunday as a high pressure system extends south from Canada across the Great Lakes region, and air quality will again be mostly Good with the chance for some sites to reach Moderate levels of ozone or PM2.5.

By Monday, a cold front will approach from the northwest as a low pressure system and associated warm front approach from the southwest. Clouds will increase ahead of the approaching frontal boundaries with showers arriving later in the day. Air quality will be Good.

Showers will taper off on Tuesday followed by cooler winds from the northeast in the wake of the low. Good air quality will continue.

Below is the weather map for 7 a.m. on Sunday.

Weather map for 7 a.m. on Sunday, August 19.

Weather map for 7 a.m. on Sunday, August 19. Graphic is courtesy of the National Weather Service.

Extended outlook

A high pressure system will trek across the Midwest on Wednesday and Thursday, and air quality will be a mix of Good and Moderate. By Friday a low pressure system and frontal boundary will approach from the northwest, bringing showers across the area and returning air quality to 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: Friday August 17 2018