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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 | 11.5 | 9.6 | 9.7 | 10.1 | 10.4 | 10.7 | 11 | 11.2 | 11.4 | 11.5 | 11.5 | 11.5 | 11.3 | 11.2 | 11.3 | 11.3 | 11.2 | 11.2 | 11.2 | 11.3 | 11.4 | 11.2 | 11.3 | 11.3 | 11.2 |
| Boise | Idaho City | µg/m³ | 25.7 | 16.9 | 17.5 | 19.1 | 20.2 | 21.4 | 22.3 | 23.1 | 24.1 | 25.7 | 25.5 | 25.3 | 25.5 | 25.3 | 25.1 | 25 | 25 | 25.1 | 23.5 | 24 | 24.4 | 24.1 | 23.7 | 23 | 22.9 |
| Bonner | Sandpoint | µg/m³ | 17.1 | 14.1 | 14.6 | 14.9 | 14.8 | 14.9 | 14.9 | 14.8 | 14.9 | 14.9 | 15.2 | 15.3 | 15.2 | 15.2 | 15.2 | 15.4 | 15.6 | 15.5 | 15.6 | 15.9 | 16.1 | 16.1 | 16.7 | 16.6 | 17.1 |
| Bonneville | Idaho Falls | µg/m³ | 9.5 | 8.4 | 8.8 | 8.9 | 9.1 | 9.4 | 9.5 | 9.4 | 9.3 | 9.4 | 9.3 | 9.4 | 9.4 | 9.2 | 9.1 | 9 | 8.9 | 8.9 | 8.8 | 8.4 | 8.1 | 7.7 | 7.4 | 7.1 | 6.9 |
| Boundary | Bonners Ferry | µg/m³ | 11 | 6.3 | 6.5 | 6.6 | 6.7 | 6.8 | 6.9 | 7 | 7.3 | 7.4 | 7.6 | 7.9 | 7.9 | 8 | 8.4 | 8.6 | 9.2 | 9.6 | 9.8 | 10.1 | 10.6 | 10.8 | 10.8 | 10.8 | 11 |
| Canyon | Nampa | µg/m³ | 18 | 12.6 | 12.7 | 13 | 13.4 | 13.5 | 14 | 14.4 | 14.6 | 15 | 15.1 | 15.5 | 15.7 | 15.7 | 15.8 | 16.1 | 16.1 | 16.4 | 16.3 | 16.2 | 16 | 16.2 | 16.9 | 17.5 | 18 |
| Franklin | Preston | µg/m³ | 6.9 | 6.9 | 6.7 | 6.6 | 6.6 | 6.4 | 6.2 | 6.2 | 6.1 | 6.1 | 6.1 | 6 | 6 | 6 | 5.8 | 5.7 | 5.7 | 5.9 | 6 | 5.7 | 5.4 | 5.4 | 5.5 | 5.6 | 5.6 |
| Idaho | Grangeville | µg/m³ | 8.7 | 5.7 | 5.7 | 6.8 | 7.2 | 7.3 | 7.3 | 7.4 | 7.8 | 8.7 | 8.5 | 8.4 | 8.4 | 8.4 | 8.1 | 8.1 | 8.4 | 8.7 | 8.3 | 6.9 | 6.9 | 7.1 | 7 | 7 | 7 |
| Kootenai | Coeur d'Alene | µg/m³ | 16.5 | 16 | 16.1 | 16.4 | 16.5 | 16 | 15.9 | 15.8 | 15.5 | 15.3 | 15.1 | 15.1 | 15.1 | 15 | 15 | 15.2 | 15.3 | 15 | 14.8 | 15.1 | 15.7 | 15.7 | 15.7 | 15.6 | 15.4 |
| Lemhi | Salmon | µg/m³ | 15.2 | 15.2 | 13.7 | 13 | 12.7 | 13.1 | 13.5 | 13.5 | 13.6 | 13.2 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.7 | 12.5 | 13 | 13.9 | 13.9 | 13.8 | 14 | 14.5 | 14.1 | 15 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 15.6 | 15 | 15.5 | 15.6 | 15.4 | 15.4 | 15.2 | 15.2 | 15.2 | 15.1 | 14.9 | 15.3 | 15.2 | 15.1 | 15.2 | 15.6 | 15 | 14.8 | 14.7 | 14.5 | 15.1 | 14.2 | 14.3 | 14.1 | 13.8 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 14 | 10.6 | 10.7 | 10.8 | 11 | 11.2 | 11.2 | 11.3 | 11.4 | 11.2 | 11.5 | 12.5 | 12.9 | 13.2 | 13.8 | 14 | 14 | 13.7 | 13.3 | 12.8 | 12.8 | 12.5 | 12.3 | 12.1 | 12.1 |
| Nez Perce | Lewiston | µg/m³ | 13.5 | 11.6 | 11.6 | 11.6 | 11.5 | 11.5 | 11.3 | 11.3 | 11.6 | 11.8 | 11.7 | 12.2 | 12.5 | 13.2 | 13.3 | 13.5 | 13.2 | 13 | 12.7 | 12.4 | 12.2 | 12.1 | 11.7 | 11.6 | 11.5 |
| Shoshone | Pinehurst | µg/m³ | 24.1 | 21.4 | 22.2 | 22.8 | 23.1 | 23 | 23.1 | 23.8 | 24 | 24 | 24.1 | 24 | 24.1 | 24.1 | 24.1 | 23.9 | 24 | 23.4 | 23.9 | 23.9 | 23.7 | 23.5 | 23.7 | 23 | 21.6 |
| Twin Falls | Twin Falls | µg/m³ | 7.9 | 7.2 | 7.2 | 7.3 | 6.7 | 6.6 | 6.5 | 6.4 | 6 | 6.1 | 6.1 | 6.1 | 6.1 | 6.2 | 6.2 | 6.3 | 6.5 | 6.6 | 6.7 | 6.7 | 6.9 | 7.4 | 7.7 | 7.8 | 7.9 |
