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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:
David Bizot

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]. For more information about the AQI and the federal ozone standard, see Wisconsin Statewide Air Quality Notices.

Monday, November 5 - Monday, November 12, 2018

Note: Ozone monitoring season ended on October 15, 2018. Ozone forecasts will resume in late April, when the 2019 ozone season begins.

Particle pollution (PM2.5)

Good and Low Moderate air quality.

Weather outlook

PM2.5 air quality is Good across Wisconsin this Monday. A low pressure system and associated cold front will bring periods of rain to the Badger State Monday night and through the day on Tuesday. Rain could change to snow in the northern part of the state. Air quality will remain Good Monday and Tuesday.

Showers will taper off Wednesday, leaving cooler air and cloudy skies in their wake as a secondary cold front passes through the area. Good air quality will continue.

Moving into Thursday, a high pressure system will build into the Midwest from western Canada. Air quality will remain Good.

Friday’s weather will remain mostly influenced by high pressure, but a weak low will quickly pass through during the day, stirring up some chance of isolated precipitation. Air quality will remain mostly Good, but Low-end Moderate levels of Fine Particulates are possible at some sites.

Moderate PM levels are possible on Saturday as a high pressure center passes by to our south, and another low pressure system approaches from the west.

Air quality will return to the Good range on Sunday as the low quickly passes through the state and departs.

High pressure and cool air from the north will move in on Monday the 12th, keeping air quality in the Good range.

Below is the weather map for 6 p.m. on Wednesday.

Weather map for 7 p.m. on Wednesday, November 7, 2018

Weather map for 6 p.m. on Wednesday, November 7, 2018. Graphic is courtesy of the National Weather Service.

Extended outlook

Air quality will remain in the Good range for the early part of the work week on the 12th through the 14th as the high pressure system departs. Depending on how quickly the high makes itself scarce, a strong low pressure system moving through the southern U.S. could bring storms to the Midwest around mid-week.

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: Tuesday November 06 2018