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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Ashland | Bad River Tribal School | ppb | 27.8 | 01 AM | 27.2 | 12 AM |
| Dodge | Horicon Wildlife Area | ppb | 23.8 | 05 AM | 25.3 | 05 AM |
| Forest | Potawatomi | ppb | 29.7 | 05 AM | 32.0 | 12 AM |
| Milwaukee | Milwaukee-SER DNR HQ | ppb | 22.4 | 05 AM | 24.3 | 03 AM |