Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Ashland | Bad River Tribal School | µg/m³ | 2 | 12 AM | 2.2 | 12 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 4.5 | 01 AM | 5 | 12 AM |
| Sauk | Devils Lake | µg/m³ | 5.2 | 01 AM | 7.3 | 01 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 4.8 | 01 AM | 9.5 | 01 AM |
| Brown | Green Bay East High | µg/m³ | 3.3 | 12 AM | 3.9 | 12 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 3.2 | 12 AM | 3.9 | 12 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 4.3 | 01 AM | 6.8 | 12 AM |
| La Crosse | La Crosse DOT | µg/m³ | 6.9 | 01 AM | 8.6 | 12 AM |
| Dane | Madison East | µg/m³ | 5.6 | 01 AM | 6.5 | 12 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 6.1 | 01 AM | 6 | 12 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 4.8 | 01 AM | 6 | 01 AM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 5.1 | 01 AM | 5.5 | 01 AM |
| Milwaukee | Milwaukee-College Ave P&R | µg/m³ | ||||
| Milwaukee | Milwaukee-SER DNR HQ | µg/m³ | 4.8 | 01 AM | 5.2 | 01 AM |
| Taylor | Perkinstown | µg/m³ | 3.2 | 01 AM | 5.5 | 01 AM |
| Forest | Potawatomi | µg/m³ | 2.4 | 12 AM | 3 | 12 AM |
| Grant | Potosi | µg/m³ | 9.7 | 01 AM | 17.4 | 01 AM |
| Vilas | Trout Lake | µg/m³ | 1.8 | 12 AM | 2.1 | 12 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 4.8 | 01 AM | 6.2 | 01 AM |