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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 | 12 | 10.4 | 8.9 | 7.4 | 5.8 | 4.5 | 3.7 | 2.4 | 1.4 | 1.4 | 1.8 | 2.9 | 4.5 | 6.6 | 8.9 | 11 | 12.4 | 12.7 | 12.4 | 11.5 | 10.1 | 8.1 | 5.9 | 4.4 |
| Portland Metro | Tualatin Bradbury Court | ppb | 7.5 | 6.1 | 4.7 | 3.2 | 2.6 | 2.5 | 2.5 | 2.4 | 2.4 | 2.7 | 3.2 | 4.6 | 6.6 | 9.1 | 11.7 | 14.1 | 15.6 | 15.5 | 14.8 | 13.4 | 11.3 | 8.7 | 6.1 | 3.7 |
