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| Region | Site | Units | 8-Hour | Hour Of Day | 1-Hour | Hour Of Day |
|---|---|---|---|---|---|---|
| Willamette Valley | Eugene Saginaw | ppb | ||||
| Portland Metro | Portland SE Lafayette | ppb | 29.6 | 01 AM | 22 | 01 AM |
| Portland Metro | Tualatin Bradbury Court | ppb | 27.9 | 01 AM | 24.6 | 01 AM |
