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.

Tuesday, May 26 - Sunday, May 31, 2015

Particle pollution (PM2.5)

Mostly Good air quality this week, Moderate on Thursday.


Mostly Good air quality this week, Moderate on Thursday.

Weather outlook

Air quality is in the Good range this Tuesday morning across Wisconsin. Showers are expected across the area this afternoon. A weak cold front will also move the region tonight. Winds will be more westerly on Wednesday which will help keep air quality in the Good range.

Southerly winds and sunny skies will return on Thursday, along with increasing chances of Moderate air quality. Clouds will increase overnight Thursday into Friday. Showers and thunderstorms are likely Friday. Ozone values should be in the Good range on Friday due to the cloud cover but PM2.5 concentrations may reach the Moderate category at some sites. A cold front should be moving southward the area later Friday. High pressure will bring cooler temperatures and northeast winds to Wisconsin for the upcoming weekend. Air quality should remain in 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 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 May 26 2015