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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bannock | Pocatello | µg/m³ | 7.1 | 3.1 | 3.3 | 3.4 | 3.5 | 3.7 | 3.8 | 3.9 | 4.1 | 4.3 | 4.5 | 4.7 | 4.9 | 5.1 | 5.3 | 5.4 | 5.4 | 5.6 | 5.9 | 6.2 | 6.4 | 6.6 | 6.7 | 7 | 7.1 |
| Boise | Idaho City | µg/m³ | 15.7 | 11.6 | 11.3 | 11.5 | 11.4 | 11.6 | 11.5 | 11.7 | 11.7 | 12.1 | 12.3 | 12.2 | 12.7 | 13.3 | 13.8 | 13.7 | 14 | 14.1 | 14.1 | 14.3 | 14.5 | 14.8 | 14.8 | 15.4 | 15.7 |
| Bonner | Sandpoint | µg/m³ | 6.3 | 6.3 | 6.2 | 6.1 | 5.8 | 5.7 | 5.5 | 5.1 | 5 | 5 | 4.9 | 4.7 | 4.7 | 4.5 | 4.2 | 4 | 3.8 | 3.8 | 3.9 | 4 | 4 | 4 | 4.2 | 4.5 | 4.7 |
| Bonneville | Idaho Falls | µg/m³ | 6.4 | 2.7 | 3 | 3.1 | 3.1 | 3.2 | 3.4 | 3.6 | 3.6 | 3.7 | 4 | 4.3 | 4.6 | 4.9 | 5 | 5.3 | 5.7 | 6.1 | 6.3 | 6.4 | 6.3 | 6.1 | 6.1 | 5.9 | 6 |
| Boundary | Bonners Ferry | µg/m³ | 6 | 4.9 | 4.7 | 4.1 | 3.7 | 3.4 | 3.3 | 3.2 | 3.1 | 2.9 | 2.9 | 2.6 | 2.8 | 3.4 | 4.1 | 4.5 | 4.8 | 4.8 | 4.9 | 5.4 | 5.8 | 5.7 | 5.9 | 6 | 5.9 |
| Canyon | Nampa | µg/m³ | 60.2 | 54.7 | 55.3 | 55.8 | 56.4 | 57.1 | 57.4 | 57.7 | 58.4 | 59.1 | 59.5 | 59.9 | 60.2 | 60 | 59 | 58.5 | 58 | 57.8 | 57.7 | 57.6 | |||||
| Kootenai | Coeur d'Alene | µg/m³ | 6.7 | 6.7 | 6.1 | 5.7 | 5.2 | 4.5 | 3.8 | 3.5 | 3.3 | 3.4 | 3.5 | 3.5 | 3.4 | 3.3 | 3.2 | 3.3 | 3.5 | 3.5 | 3.5 | 3.6 | 3.8 | 4 | 4 | 4.1 | 4.3 |
| Lemhi | Salmon | µg/m³ | 30 | 28.4 | 29.7 | 29.6 | 28.8 | 29.2 | 29.2 | 28.9 | 28.7 | 28.3 | 28.4 | 28.9 | 29.3 | 29.3 | 29.2 | 29.2 | 29.5 | 29.8 | 30 | 29.5 | 29.2 | 29 | 28.6 | 28.7 | 28.3 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 23 | 15.9 | 16.5 | 17.2 | 17.7 | 18.2 | 19.2 | 20 | 20.4 | 21 | 21.6 | 21.5 | 21.5 | 21.9 | 22.4 | 22.5 | 22.8 | 23 | 23 | 23 | 22.9 | 22.7 | 22.8 | 22.6 | 22.2 |
| Nez Perce | Lewiston | µg/m³ | 13.8 | 10.2 | 10.7 | 10.5 | 10.1 | 10.3 | 10.2 | 10.3 | 10.4 | 10.8 | 11 | 11.2 | 11.5 | 11.8 | 12.1 | 12.1 | 12.2 | 12.5 | 12.5 | 12.6 | 12.8 | 13 | 13.2 | 13.5 | 13.8 |
| Shoshone | Pinehurst | µg/m³ | 15.9 | 15.9 | 14.8 | 13.9 | 12.5 | 11 | 10.1 | 9.2 | 8.4 | 7.5 | 6.2 | 6 | 5.7 | 5.6 | 5.5 | 5.6 | 5.6 | 5.8 | 6 | 6.2 | 6.4 | 7 | 7.2 | 7.4 | 8 |
| Twin Falls | Twin Falls | µg/m³ | 4 | 2.6 | 2.7 | 3 | 3 | 3.1 | 3.2 | 3.3 | 3.3 | 3.4 | 3.4 | 3.3 | 3.4 | 3.6 | 3.7 | 3.7 | 3.9 | 3.9 | 4 | 4 | 4 | 3.8 | 3.8 | 3.7 | 3.8 |
