Highest PM2.5
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| County | Site | Units | 24-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | µg/m³ | 10.2 | 06 PM | 13.4 | 06 PM |
| Ashland | Bad River Tribal School | µg/m³ | 5.3 | 12 AM | 5.5 | 10 AM |
| Kenosha | Chiwaukee Prairie | µg/m³ | 12 | 06 PM | 19 | 06 PM |
| Sauk | Devils Lake | µg/m³ | 9.9 | 06 PM | 12 | 05 PM |
| Eau Claire | Eau Claire DOT Sign Shop | µg/m³ | 7.4 | 05 PM | 9.2 | 10 AM |
| Brown | Green Bay East High | µg/m³ | 10.7 | 06 PM | 13.3 | 06 PM |
| Ozaukee | Harrington Beach Park | µg/m³ | 9.6 | 06 PM | 12 | 02 PM |
| Dodge | Horicon Wildlife Area | µg/m³ | 9.6 | 06 PM | 11.2 | 05 PM |
| La Crosse | La Crosse DOT | µg/m³ | 9.3 | 11 AM | 10.3 | 12 AM |
| Dane | Madison East | µg/m³ | 10.4 | 06 PM | 13.5 | 11 AM |
| Dane | Madison University Ave. Well #6 | µg/m³ | 10.4 | 04 PM | 12.8 | 06 PM |
| Milwaukee | Milwaukee-16th St. Health Center | µg/m³ | 12.2 | 06 PM | 17.2 | 05 PM |
| Milwaukee | Milwaukee-College Ave NR | µg/m³ | 12.2 | 06 PM | 18.2 | 05 PM |
| Taylor | Perkinstown | µg/m³ | 6 | 05 AM | 7.5 | 03 AM |
| Forest | Potawatomi | µg/m³ | 6 | 08 AM | 7 | 07 AM |
| Grant | Potosi | µg/m³ | 12.3 | 05 PM | 14.5 | 02 PM |
| Vilas | Trout Lake | µg/m³ | 4.9 | 03 AM | 5.4 | 09 AM |
| Waukesha | Waukesha-Cleveland Ave. | µg/m³ | 11.7 | 06 PM | 14.9 | 01 PM |