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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 | 14.9 | 10.4 | 6.8 | 4.9 | 2.8 | 1.4 | 1.1 | 0.5 | 0.8 | 2.4 | 5.1 | 8.6 | 12.4 | 16.4 | 20.6 | 25.1 | 29.6 | 32.7 | 33.1 | 31.4 | 27.9 | 23.9 | 19.7 | 15.1 |
| Portland Metro | Tualatin Bradbury Court | ppb | 14.1 | 10.8 | 8.3 | 6 | 4 | 2.8 | 2.6 | 2.4 | 2.9 | 4.5 | 7.4 | 10.5 | 13.9 | 17.4 | 21.6 | 26.1 | 29.8 | 31.4 | 30.7 | 28.8 | 25.8 | 22.6 | 19 | 14.5 |
