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, March 23 - Sunday, March 29, 2015

Note: Ozone forecasts will resume in late April, when the 2015 ozone season begins.

Particle pollution (PM2.5)

Mostly Good air quality this week.

Weather outlook

PM2.5 air quality is in the Good range this Monday morning across Wisconsin. An early spring snow storm is making its way across the Midwest this morning. High pressure located to the north of Wisconsin will control the weather for most of Tuesday. Winds will be southeasterly and air quality will be in the Good range.

Southerly winds, warmer air and more precipitation are likely Tuesday night into Wednesday. Light winds on Wednesday may lead to favorable conditions for some Moderate PM2.5 values.

A strong cold front will pass through the state on Thursday and return Good air quality to region for several days. Winds will become light and southerly again on Saturday, which will be another favorable period for possible Moderate air quality.

Very windy conditions are forecast for Sunday as another cold front crosses the state. This should lead to Good air quality for Sunday into Monday.

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 March 23 2015