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| County | Site | Units | Max | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Benewah | Plummer - Coeur d'Alene Tribe | µg/m³ | 6.9 | 6.7 | 6.9 | 6.7 | 6.7 | 6.3 | 5.9 | 5.3 | 5.2 | 4.6 | 4.5 | 4.3 | 3.9 | 3.7 | 3.2 | 2.7 | 2.3 | 2.1 | 1.8 | 1.2 | 1 | 0.3 | 0 | -0.3 | -0.7 |
| Boundary | Bonners Ferry | µg/m³ | 4.4 | 2.6 | 2.8 | 3.1 | 3.3 | 3.6 | 3.7 | 3.6 | 3.7 | 3.7 | 3.5 | 3.3 | 3.4 | 3.3 | 3.5 | 3.8 | 3.9 | 3.8 | 4.1 | 4.2 | 4.3 | 4.4 | 4.2 | 4.1 | 4.2 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 18.4 | 12.7 | 12.6 | 12.5 | 12.7 | 13.2 | 13.5 | 13.8 | 14.1 | 14.2 | 14.5 | 15 | 15.4 | 15.5 | 15.7 | 15.7 | 16.1 | 16.5 | 16.7 | 17.2 | 17.4 | 18.1 | 18.2 | 17.9 | 18.4 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 12.6 | 11.2 | 11.2 | 11.4 | 11.6 | 11.9 | 12.1 | 12.1 | 12.4 | 12.5 | 12.6 | 12.5 | 12.3 | 11.5 | 10.5 | 9.2 | 8.6 | 7.8 | 6.8 | 7 | 7.2 | 7.5 | 7.4 | 7.3 | 7.2 |
