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air quality notice history for all Wisconsin counties.
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list of air quality notices for Wisconsin.
Contact information
For further information on air quality notices, contact:
Grant Hetherington
Air management specialist

Current Wisconsin statewide air quality notices

  No Air Quality Notices

    As of 11:54 am CT Wednesday, May 25, 2016 there are no DNR Air Quality Notices for Wisconsin.

Air Quality Status County Selection Form

The DNR uses weather forecasts and data from air monitoring sites to determine air quality in the state and notifies residents when pollutants reach unhealthy levels based on the Air Quality Index (AQI) [exit DNR]. The AQI includes two pollutants that can cause health problems in humans - ozone and particle pollution.

To protect public health, the DNR may issue an advisory even though pollutant levels at some locations have not yet reached unhealthy levels. Forecasters evaluate weather conditions and typically issue an advisory when pollutant levels are rising and at least one monitor has exceeded the standard.

How AQI ranges correspond to ozone and fine particle (PM2.5) concentrations

The ozone AQI is calculated from 8-hour rolling average concentrations. The PM2.5 AQI is calculated using the 24-hour rolling average concentrations from the continuous monitors.

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 0-54 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

Current air quality resources

Last revised: Wednesday, July 08, 2015