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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.

Thursday, October 20 - Sunday, October 23, 2016

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 in Wisconsin this Thursday. High pressure is building back into the region behind a cold front that passed through last night. Conditions will remain windy and cool through tomorrow, and Good air quality will persist. The weekend will feature more sunshine, warmer temperatures and calmer winds. Air quality will be a mix of Good and Moderate. A weak surface Low pressure system will pass across Wisconsin Sunday into Monday, bringing northerly winds and returning us to Good air quality for the start of the work week.

Extended outlook: High pressure will dominate Wisconsin weather for the early part of next week. Air quality will be Good with the possibility for some Moderate values increasing as the week goes on.

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: Thursday October 20 2016