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| Region | Site | Units | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Portland Metro | Portland SE Lafayette | ppb | 23.1 | 24.9 | 26 | 26.5 | 27.3 | 27 | 26.9 | 26.7 | 26.9 | 26.1 | 25.7 | 25.8 | 26.5 | 27.1 | 27.7 | 28.5 | 28.7 | 28.6 | 29.4 | 29.8 | 30 | 31.1 | 32 | 32.6 |
| Portland Metro | Tualatin Bradbury Court | ppb | 25.1 | 25.7 | 26.8 |
