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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:
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, which will be updated as needed.

Monday, August 31 - Sunday, September 6, 2015

Particle pollution (PM2.5)

Mix of Good and Moderate air quality this week.


Mix of Good and Moderate air quality this week.

Weather outlook

Ozone air quality is in the Good range this Monday morning across Wisconsin. PM2.5 is mostly in the Good range with Moderate values found in Milwaukee County.

The big weather story this week will be a stretch of very warm to almost hot weather through next weekend. Humidity levels will be high as well. Skies will generally be sunny and winds will be from a southerly direction.

These conditions will be favorable for Moderate levels of ozone and PM2.5. Ozone levels could reach the Unhealthy for Sensitive Groups (USG) category sometime during the week. This would most likely occur in the counties bordering Lake Michigan.

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 fine particle 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 0-59 0.0 to 12.0
Moderate 51-100 60-75 12.1 to 35.4
Unhealthy for Sensitive Groups 101-150 76-95 35.5 to 55.4
Unhealthy 151-200 96-115 55.5 to 140.4
Very Unhealthy 201-300 116-374 140.5 to 210.4
Hazardous > 300 > 374 > 210.4
Last revised: Tuesday September 01 2015