Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 66.5 | 11 PM | 97.6 | 10 AM |
| Ashland | Bad River Tribal School | µg/m³ | 94.5 | 10 AM | 97.9 | 04 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 33 | 11 PM | 51.4 | 11 PM |
| Sauk | Devils Lake | µg/m³ | 46.9 | 11 PM | 83.7 | 11 AM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 68 | 08 AM | 100.9 | 07 AM |
| Brown | Green Bay East High | µg/m³ | 73.7 | 11 PM | 106.2 | 11 AM |
| Ozaukee | Harrington Beach Park | µg/m³ | 36.6 | 11 PM | 60.5 | 09 PM |
| Jackson | Ho-Chunk Nation-Black River Falls | µg/m³ | 55 | 10 AM | 88.4 | 09 AM |
| Monroe | Ho-Chunk Nation-Tomah | µg/m³ | 49.8 | 01 PM | 92.6 | 09 AM |
| Dodge | Horicon Wildlife Area | µg/m³ | 47 | 11 PM | 70 | 02 PM |
| Marathon | Lake Dubay | µg/m³ | 59.7 | 02 PM | 87 | 10 AM |
| Dane | Madison East | µg/m³ | 35.4 | 11 PM | 72.1 | 10 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 39.9 | 11 PM | 88.4 | 10 AM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 48.3 | 11 PM | 79 | 09 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 44 | 11 PM | 68.8 | 06 PM |
| Forest | Potawatomi | µg/m³ | 88.3 | 02 PM | 98 | 06 AM |
| Grant | Potosi | µg/m³ | 20.8 | 11 AM | 42.3 | 09 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 49.1 | 11 PM | 76.1 | 09 PM |