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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 for Wisconsin, which will be updated as needed.

Forecasts are reported using the Air Quality Index (AQI) [exit DNR]. The AQI has recently changed to reflect the new federal ozone standard. See Wisconsin Statewide Air Quality Notices for details.

Monday, September 18 - Friday, September 22, 2017


Good and Moderate levels.

Particle pollution (PM2.5)

Good and Moderate levels.

Weather outlook

PM2.5 and ozone air quality are Good across Wisconsin this Monday. A high pressure center sits over the northern portion of the state Monday. Good air quality will continue through Tuesday, when a warm front will approach from the south and bring the chance for rain and thunderstorms to the region. The frontal passage will bring an increase in temperatures and strong winds from the south to the Badger State on Wednesday. With cloud cover breaking up as well, Moderate ozone levels are expected particularly in the southern Wisconsin.

A cold front is expected to cross Wisconsin overnight into Thursday, bringing another dose of rain showers and a wind shift as a small pocket of high pressure passes through the Midwest. Winds will begin to turn southerly again by Thursday night as a broad and slow moving low pressure system approaches. Moderate air quality could continue Thursday and beyond.

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

Weather map for 7:00 a.m. on Wednesday, September 20.

Weather map for 7:00 a.m. Wednesday, September 20. Graphic is courtesy of the National Weather Service.

Extended outlook

As low pressure gradually closes in on the Midwest, we will endure an extended period of southerly flow, warm temperatures and humidity. Precipitation associated with the low pressure system may not reach Wisconsin until Sunday or Monday. Moderate air quality will continue through the 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 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: Monday September 18 2017