Dirty Air Alerts For Five WI Counties Through Tomorrow Evening
Current Wisconsin statewide air quality notices
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 - ozoneand 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.
| AQI Levels of Health Concern | Numerical Value | 8-hr Ozone (ppb) | 24-hr PM2.5 (ug/m3) |
|---|---|---|---|
| Good | 0-50 | 0-59 | 0.0 to 12.0 |
| Moderate | 51-100 | 60-75 | 12.1 to 35.4 |
| Unhealthy for Sensitive Groups | 101-150 | 76-95 | 35.5 to 55.4 |
| Unhealthy | 151-200 | 96-115 | 55.5 to 140.4 |
| Very Unhealthy | 201-300 | 116-374 | 140.5 to 210.4 |
| Hazardous | > 300 | > 374 | > 210.4 |
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