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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 | 21.6 | 17 | 16.9 | 17 | 17 | 17.1 | 17 | 17 | 17.3 | 17.5 | 17.8 | 17.9 | 17.9 | 17.9 | 17.9 | 18 | 18.2 | 18.1 | 18 | 18 | 18.1 | 18.9 | 19.5 | 20.7 | 21.6 |
| Boise | Idaho City | µg/m³ | 20.1 | 15.7 | 16.2 | 16.8 | 17.6 | 18.3 | 18.7 | 19.2 | 19.7 | 19.9 | 20.1 | 20 | 19.5 | 19.4 | 19.5 | 19.3 | 19.5 | 19.6 | 19.5 | 19.2 | 18.8 | 18.3 | 18.1 | 17.7 | 17.2 |
| Bonner | Sandpoint | µg/m³ | 8.9 | 6.1 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.1 | 6.2 | 6.2 | 6.5 | 6.7 | 6.8 | 6.9 | 6.9 | 7 | 7.2 | 7.5 | 7.8 | 8.2 | 8.5 | 8.5 | 8.5 | 8.7 | 8.9 |
| Bonneville | Idaho Falls | µg/m³ | 15.5 | 12 | 12.2 | 12.2 | 12.5 | 12.8 | 13.2 | 13.6 | 13.8 | 13.9 | 13.9 | 14 | 14 | 14.3 | 14.3 | 14.6 | 14.7 | 15.1 | 15.4 | 15.4 | 15.4 | 15.5 | 15.4 | 15.3 | 14.9 |
| Boundary | Bonners Ferry | µg/m³ | 9.6 | 8.5 | 8.5 | 8.7 | 8.5 | 8.6 | 8.5 | 8.5 | 8.7 | 8.8 | 8.9 | 9.4 | 9.6 | 9.6 | 9.5 | 7.3 | 7.6 | 7.7 | 7.8 | 8 | 8.3 | 8.6 | 8.9 | 8.9 | 8.9 |
| Canyon | Nampa | µg/m³ | 20.8 | 19.6 | 19.1 | 18.8 | 18.7 | 19.1 | 19.4 | 19.9 | 20.4 | 20.8 | 20.7 | 20.1 | 19.8 | 19.7 | 19.2 | 18.2 | 17.5 | 16.8 | 16.1 | 15.2 | 14.6 | 14 | 13.4 | 12.7 | 12.8 |
| Kootenai | Coeur d'Alene | µg/m³ | 8.4 | 5.7 | 5.7 | 5.7 | 5.9 | 6 | 5.9 | 6.1 | 6.2 | 6.3 | 6.3 | 6 | 5.7 | 5.3 | 5.6 | 5.9 | 6 | 6.5 | 6.8 | 7.1 | 7.4 | 7.6 | 7.7 | 8.1 | 8.4 |
| Lemhi | Salmon | µg/m³ | 11.6 | 11.5 | 11.6 | 11.5 | 11.3 | 11.1 | 11.1 | 11.2 | 11.5 | 11.5 | 11.2 | 11.1 | 11 | 10.7 | 10.5 | 10.4 | 10.6 | 10.6 | 10.3 | 10.4 | 10.2 | 10.2 | 10.3 | 10.3 | 10.3 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 13.4 | 5.5 | 5.5 | 5.8 | 5.8 | 5.6 | 5.8 | 5.9 | 6.4 | 6.5 | 7.1 | 7.5 | 7.8 | 8.1 | 9.8 | 10 | 10 | 10 | 10.4 | 11.3 | 12.1 | 12.6 | 13 | 13.2 | 13.4 |
| Nez Perce | Lewiston | µg/m³ | 49.5 | 6.4 | 7 | 10.4 | 14.2 | 18.5 | 23.1 | 27.3 | 32.3 | 37.7 | 42.3 | 45.1 | 46.4 | 45 | 43.8 | 44 | 44.5 | 44.7 | 45.1 | 45.8 | 47.5 | 48.5 | 48.8 | 49 | 49.5 |
| Shoshone | Pinehurst | µg/m³ | 8 | 6.5 | 6.5 | 6.5 | 6.6 | 6.6 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.7 | 6.9 | 6.9 | 7 | 7.1 | 7.4 | 7.5 | 7.7 | 7.8 | 8 | 8 | 8 | 8 |
| Twin Falls | Twin Falls | µg/m³ | 22.1 | 21 | 21 | 21.1 | 21.1 | 21.2 | 21.4 | 21.4 | 21.3 | 21.1 | 21.4 | 21.7 | 22 | 22.1 | 21.9 | 21.6 | 21.6 | 19.3 | 18.3 | 18.7 | 17.9 | 17.5 | 17.2 | 17 | 17.3 |
