Highest AQI
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| County | Site | AQS ID | AQI Level | Pollutant | Occured | AQI |
|---|---|---|---|---|---|---|
| Kenosha | Chiwaukee Prairie | 55 059 0019 | Good | OZONE | 04 PM | 41 |
| Dodge | Horicon Wildlife Area | 55 027 0001 | Good | OZONE | 07 PM | 35 |
| Grant | Potosi | 55 043 0009 | Good | PM2.5 | 12 AM | 43 |
| Waukesha | Waukesha-Cleveland Ave. | 55 133 0027 | Good | PM2.5 | 12 AM | 33 |
| Milwaukee | Milwaukee-College Ave NR | 55 079 0056 | Good | NO2 | 08 PM | 24 |
| Dane | Madison East | 55 025 0041 | Good | PM2.5 | 02 AM | 21 |
| Dane | Madison University Ave. Well #6 | 55 025 0047 | Good | PM2.5 | 12 AM | 32 |
| Oneida | Rhinelander Tower | 55 085 0996 | Good | SO2 | 12 AM | 0 |
| Outagamie | Appleton | 55 087 0009 | Good | PM2.5 | 08 AM | 23 |
| Kenosha | Kenosha-Water Tower | 55 059 0025 | Good | OZONE | 04 PM | 40 |
| Eau Claire | Eau Claire DOT Sign Shop | 55 035 0014 | Good | OZONE | 05 PM | 35 |
| Outagamie | Kaukauna | 55 087 0015 | Good | SO2 | 09 AM | 3 |
| Ashland | Bad River Tribal School | 55 003 0010 | Good | OZONE | 07 PM | 42 |
| Brown | Green Bay East High | 55 009 0005 | Good | PM2.5 | 12 AM | 23 |
| Forest | Potawatomi | 55 041 0007 | Good | OZONE | 10 PM | 35 |