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, July 21 - Sunday, July 27, 2014

Particle pollution (PM2.5)

Moderate air quality early this week, then becoming Good.

Ozone pollution

Unhealthy for Senstive Groups (USG) and Moderate air quality early this week, then becoming Good.

Weather outlook

Ozone air quality is in the Good range and PM2.5 is a mix of Good and Moderate this Monday morning across Wisconsin. Sunny skies, very warm temperatures and southerly winds are expected today and Tuesday across Wisconsin; these conditions are favorable for ozone formation. USG levels of ozone are likely today in counties along the Lake Michigan shoreline. Stronger southwest winds on Tuesday may help keep levels in the Moderate range. A cold front will pass through Wisconsin Tuesday night. Cooler and drier weather will settle across the Great Lakes region from Wednesday into Friday along with Good air quality. Warmer and more humid air will head back towards Wisconsin next weekend, which may lead to clouds and showers. Moderate air quality is possible for next weekend.

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: Monday July 21 2014