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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 | 10 | 10 | 9.7 | 9.7 | 9.7 | 9.5 | 9.4 | 9.3 | 9.4 | 9.4 | 9.5 | 9.5 | 9.5 | 9.3 | 9 | 9.2 | 9.2 | 9 | 8.9 | 8.7 | 8.5 | 8.3 | 8.2 | 8.2 | 8.3 |
| Boise | Idaho City | µg/m³ | 30.3 | 28.8 | 29.4 | 30.3 | 30 | 30 | 30.3 | 29.6 | 29.6 | 28.7 | 28.5 | 28.5 | 28.6 | 28.6 | 28.6 | 28.6 | 28.6 | 28.4 | 27.4 | 25.2 | 24.7 | 24.2 | 23.8 | 22.6 | 21.6 |
| Bonner | Sandpoint | µg/m³ | 14.2 | 14.2 | 13.7 | 13.4 | 13.1 | 13 | 12.8 | 12.7 | 12.3 | 12.1 | 11.7 | 11.5 | 11.5 | 11.5 | 11.5 | 11.4 | 11.3 | 11.3 | 11.4 | 11.3 | 10.9 | 10.5 | 10 | 9.4 | 9.3 |
| Bonneville | Idaho Falls | µg/m³ | 6.6 | 5 | 5.1 | 5.1 | 5 | 5.2 | 5.2 | 5.4 | 5.5 | 5.6 | 5.6 | 5.9 | 5.8 | 5.7 | 6 | 6.1 | 6.2 | 6.1 | 6.1 | 6.2 | 6.3 | 6.3 | 6.2 | 6.3 | 6.6 |
| Boundary | Bonners Ferry | µg/m³ | 7 | 7 | 6.6 | 6.4 | 6 | 5.9 | 5.9 | 5.8 | 6.1 | 6.2 | 6.1 | 5.9 | 5.9 | 5.8 | 5.6 | 5.5 | 5.3 | 5 | 4.9 | 4.8 | 4.6 | 4.8 | 4.8 | 5 | 5 |
| Canyon | Nampa | µg/m³ | 21.8 | 20.9 | 20.7 | 21 | 21.2 | 21.3 | 21.3 | 21.2 | 21.2 | 21 | 21.3 | 21.2 | 21.4 | 21.5 | 21.3 | 21.5 | 21.7 | 21.8 | 21.7 | 21.5 | 21.4 | 21 | 21.2 | 21.2 | 20.8 |
| Franklin | Preston | µg/m³ | 6.3 | 4.6 | 4.7 | 4.7 | 4.9 | 5.2 | 5.4 | 5.5 | 5.6 | 5.6 | 5.7 | 5.7 | 5.7 | 5.7 | 5.9 | 6 | 6.1 | 6.2 | 6.2 | 6 | 6 | 6.1 | 6.3 | 6.3 | 6.3 |
| Idaho | Grangeville | µg/m³ | 6.7 | 6.6 | 6.6 | 6.6 | 6.5 | 6.7 | 6.3 | 6.3 | 6 | 5.7 | 6.1 | 5.7 | 6.1 | 6.2 | 6.2 | 6.4 | 6.2 | 6.1 | 6.6 | 6.3 | 6 | 5.2 | 5.3 | 5.5 | 5.6 |
| Kootenai | Coeur d'Alene | µg/m³ | 11.8 | 11.5 | 11.3 | 11.5 | 11.7 | 11.8 | 11.7 | 11.6 | 11.5 | 11.4 | 11.1 | 11 | 11 | 11 | 11.1 | 11.5 | 11.7 | 11.6 | 11.5 | 11.5 | 11.5 | 11.6 | 11.3 | 11.2 | 11.2 |
| Lemhi | Salmon | µg/m³ | 13.7 | 13.7 | 13.7 | 13.7 | 13.1 | 13 | 12.1 | 11.7 | 11.5 | 11 | 11.2 | 11.5 | 11.7 | 11.8 | 11.6 | 11.5 | 11.5 | 11.5 | 11.6 | 12.3 | 12.1 | 11.5 | 11.2 | 11.2 | 11.5 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 10.3 | 10.3 | 10 | 9.4 | 9.2 | 8.7 | 8.6 | 8.2 | 7.8 | 7.7 | 7.8 | 7.9 | 7.7 | 7.4 | 7.4 | 7 | 6.9 | 6.7 | 6.2 | 6.2 | 6.2 | 6 | 5.7 | 5.5 | 5.7 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 5.7 | 5.7 | 5.4 | 5.4 | 5.5 | 5.4 | 5.4 | 5.4 | 5.1 | 5.2 | 5.4 | 5.5 | 5.3 | 5.2 | 5 | 4.8 | 4.7 | 4.9 | 4.6 | 4.6 | 4.5 | 4.7 | 4.8 | 4.7 | 4.5 |
| Nez Perce | Lewiston | µg/m³ | 5.5 | 5.5 | 5.4 | 5.1 | 5 | 4.9 | 4.7 | 4.7 | 4.6 | 4.6 | 4.7 | 4.6 | 4.5 | 4.2 | 4.1 | 4 | 4.1 | 4 | 4 | 4.1 | 4.2 | 4.2 | 4 | 3.8 | 3.6 |
| Shoshone | Pinehurst | µg/m³ | 11 | 10.1 | 10.3 | 10.3 | 10.5 | 10.5 | 10.6 | 10.5 | 10.4 | 10.5 | 10.6 | 10.6 | 10.6 | 10.7 | 10.9 | 11 | 11 | 10.3 | 9.7 | 9.1 | 8.7 | 8.5 | 8.2 | 7.5 | 7.2 |
| Twin Falls | Twin Falls | µg/m³ | 12 | 10.2 | 10.2 | 10.1 | 10.1 | 10 | 10.2 | 10.3 | 10.4 | 10.9 | 11.2 | 11.1 | 11.2 | 11.4 | 11.5 | 11.7 | 11.7 | 11.7 | 11.8 | 12 | 12 | 12 | 12 | 11.9 | 12 |
