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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 | 15.3 | 12.6 | 11.1 | 10.6 | 10.2 | 9.5 | 9.5 | 10.6 | 11.7 | 13.1 | 15 | 17.1 | 19.6 | 22 | 24.5 | 26.4 | 27.9 | 28.9 | 28.9 | 27.9 | 26.9 | 25.6 | 23.1 | 21.3 |
| Portland Metro | Tualatin Bradbury Court | ppb | 8 | 5.8 | 4.8 | 4.2 | 4.2 | 4.8 | 6.3 | 7 | 8.1 | 9.1 | 11 | 14.3 | 16.5 | 18.3 | 19.4 | 21.4 | 23.2 | 24.8 | 24.8 | 23.7 | 22 | 20 | 18.7 | 16.9 |
