Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 23.8 | 11 PM | 32.3 | 09 PM |
| Ashland | Bad River Tribal School | µg/m³ | 10 | 12 AM | 14.8 | 04 PM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 37.7 | 06 PM | 48.9 | 12 PM |
| Sauk | Devils Lake | µg/m³ | 21.2 | 11 PM | 32.6 | 11 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 17.4 | 11 PM | 27 | 11 PM |
| Brown | Green Bay East High | µg/m³ | 23.8 | 11 PM | 34.7 | 06 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 31.2 | 10 PM | 39.5 | 08 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 24.8 | 09 PM | 30.3 | 01 AM |
| Marathon | Lake Dubay | µg/m³ | ||||
| Dane | Madison East | µg/m³ | 38.5 | 01 PM | 65.5 | 01 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 31.7 | 01 PM | 43.5 | 08 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 44 | 04 PM | 67.5 | 12 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 37.6 | 03 PM | 55.4 | 03 AM |
| Forest | Potawatomi | µg/m³ | 12.4 | 11 PM | 22.5 | 09 PM |
| Grant | Potosi | µg/m³ | 30 | 10 AM | 42.6 | 08 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 46.9 | 06 PM | 85.9 | 12 AM |