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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.

Friday, February 17 - Monday, February 20, 2017

Note: Ozone monitoring season ended on October 15, 2016. Ozone forecasts will resume in late April, when the 2017 ozone season begins.

Particle pollution (PM2.5)

Good and Moderate levels.

Weather outlook

PM2.5 air quality is in the Good range across Wisconsin this Friday morning. Hourly values are rising at some sites so low-end Moderate levels may be reached at scattered sites. Today will be mild with temperatures reaching the 50s and light southerly winds.

A weak cold front will cross the state on Saturday and shift the winds to a more northwesterly direction. Temperatures will continue to be above seasonal normal. Air quality should remain a mix of Good and scattered low-end Moderate values.

A storm system will be developing over the Rockies on Sunday. This will pull warmer air back into Wisconsin on southerly winds for Sunday and Monday. Temperatures will again be well above normal. Air quality should be a mix of Good and Moderate for both days.

Below is the weather map for 6:00 a.m. Sunday morning.

Weather map for 6:00 a.m. Sunday morning, February 19, 2017.

Weather map for 6:00 a.m. Sunday morning, February 19, 2017. Graphic is courtesy of the National Weather Service.

Extended outlook

Extended outlook: Rain will be likely with the passage of a cold front later Monday and Tuesday morning. Temperatures will remain mild through Wednesday. Air quality will, generally, be Good with a scattered Moderate possible.

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: Friday February 17 2017