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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 | 19 | 18.2 | 18.2 | 18.2 | 18.2 | 18.4 | 18.5 | 18.3 | 18.2 | 18.1 | 17.9 | 18.1 | 18.2 | 18.4 | 18.5 | 18.8 | 19 | 18.5 | 17.9 | 17.6 | 17.2 | 17 | 16.7 | 16.4 | 16.4 |
| Boise | Idaho City | µg/m³ | 17.5 | 13.5 | 13.5 | 13.4 | 13.6 | 13.8 | 13.8 | 14.1 | 14.5 | 14.6 | 15.1 | 16.2 | 16.9 | 17 | 17.3 | 17.4 | 17.4 | 17.5 | 17.4 | 17.5 | 17.3 | 16.8 | 16.9 | 16.6 | 16.3 |
| Bonner | Sandpoint | µg/m³ | 17.1 | 15.2 | 14.5 | 13.8 | 13.2 | 12.5 | 11.9 | 11.5 | 11.3 | 11.2 | 11.3 | 11.4 | 11.2 | 11.3 | 11.7 | 12 | 12.7 | 13.1 | 13.7 | 14.4 | 15 | 15.7 | 16.3 | 16.7 | 17.1 |
| Bonneville | Idaho Falls | µg/m³ | 15.1 | 15 | 14.8 | 15.1 | 14.8 | 14.7 | 14.5 | 14.4 | 14.5 | 14.4 | 14.2 | 14.1 | 14 | 14.1 | 14.2 | 14.3 | 13.9 | 14.1 | 13.9 | 14.1 | 14.2 | 14 | 14 | 14.1 | 14.1 |
| Boundary | Bonners Ferry | µg/m³ | 16 | 14.8 | 14 | 13.3 | 12.7 | 12.2 | 11.6 | 11 | 10.5 | 10 | 9.9 | 9.9 | 9.9 | 9.6 | 9.8 | 10 | 10.5 | 11.1 | 11.7 | 12.4 | 13 | 13.8 | 14.5 | 15.3 | 16 |
| Canyon | Nampa | µg/m³ | 105.4 | 103.4 | 105.3 | 105.4 | 103.6 | 97.6 | 94.3 | 91.4 | 87.3 | 81 | 75.2 | 69.5 | 65.2 | 62 | 59.2 | 55.8 | 53.4 | 52.4 | 52.8 | 51 | 48.9 | 46.4 | 44.2 | 42.7 | 41 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 25.1 | 21.2 | 21 | 20.7 | 20.7 | 20.5 | 20.5 | 20.5 | 20.6 | 20.8 | 21.1 | 21.3 | 21.6 | 21.8 | 22.2 | 22.4 | 22.9 | 23.2 | 23.9 | 24.1 | 24.3 | 24.9 | 25.1 | 24.9 | 24.8 |
| Idaho | Cottonwood | µg/m³ | 26.5 | 22.2 | 21.9 | 21.9 | 21.8 | 21.8 | 21.7 | 21.4 | 21.8 | 22.3 | 22.9 | 23.1 | 23.7 | 23.9 | 24.1 | 24 | 24.1 | 24.8 | 25 | 25.2 | 25.8 | 26.1 | 26.4 | 26.3 | 26.5 |
| Kootenai | Coeur d'Alene | µg/m³ | 17.4 | 17.4 | 16.3 | 15.2 | 14.4 | 14.2 | 13.9 | 13.6 | 13.6 | 13.5 | 13.6 | 13.6 | 13.2 | 13.2 | 13 | 13.1 | 13.5 | 14.2 | 15 | 15.4 | 15.9 | 16.2 | 16.4 | 16.9 | 17.1 |
| Latah | Juliaetta | µg/m³ | 25.1 | 18.1 | 17 | 16 | 15.7 | 15.5 | 15.5 | 15.7 | 15.7 | 15.9 | 16.5 | 17.3 | 17.4 | 18.1 | 18.4 | 18.7 | 18.7 | 19.1 | 19.3 | 19.6 | 20.1 | 21.1 | 22.2 | 23.6 | 25.1 |
| Lemhi | Salmon | µg/m³ | 10.3 | 10.3 | 10.1 | 10 | 9.7 | 9.8 | 9.7 | 9.8 | 9.5 | 9.3 | 9.1 | 9.3 | 9.3 | 9.1 | 8.7 | 8.5 | 8.6 | 8.5 | 8.7 | 8.7 | 8.4 | 8.5 | 8.5 | 8.5 | 8.5 |
| Lewis | Nezperce - Nez Perce Tribe | µg/m³ | 23.7 | 21.2 | 21.3 | 21.4 | 21.2 | 21 | 20.5 | 20.4 | 20.8 | 21.1 | 21.6 | 21.9 | 22.2 | 22.1 | 22.4 | 22.6 | 22.6 | 23.2 | 23 | 22.7 | 22.4 | 22.4 | 22.8 | 23.2 | 23.7 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 22.5 | 21.3 | 21.3 | 21.3 | 21.1 | 20.6 | 20.7 | 21 | 21.1 | 21 | 20.9 | 20.7 | 20.9 | 21.1 | 21.1 | 21.2 | 21.4 | 21.9 | 22.5 | 22.5 | 22.5 | 22 | 21.6 | 21.5 | 21.3 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 27.7 | 23.8 | 22.7 | 22.6 | 22.6 | 22.7 | 22.5 | 22.4 | 22.3 | 22.4 | 22.7 | 23.2 | 23.6 | 23.8 | 24.7 | 24.6 | 24 | 24 | 24.5 | 24.5 | 25 | 25.7 | 26.4 | 27 | 27.7 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 25.9 | 21.9 | 22.2 | 22.3 | 22.4 | 22.3 | 22.4 | 22.4 | 23 | 23.5 | 23.9 | 24.4 | 24.5 | 24.9 | 24.6 | 24.7 | 25.7 | 25.9 | 25.6 | 25.4 | 25 | 25.1 | 25.2 | 25.5 | 25.8 |
| Nez Perce | Lewiston | µg/m³ | 28.7 | 20.7 | 20.7 | 20.6 | 20.9 | 21.5 | 22 | 21.9 | 21.9 | 22.1 | 22.6 | 23.5 | 24.1 | 24.5 | 24.7 | 25.3 | 25.4 | 24.9 | 25.5 | 26.4 | 27.1 | 27.2 | 27.3 | 27.9 | 28.7 |
| Shoshone | Pinehurst | µg/m³ | 22.2 | 18.8 | 18.4 | 18 | 17 | 16 | 15.5 | 15.2 | 15 | 14.7 | 14.6 | 14 | 13.7 | 13.5 | 13.5 | 13.7 | 14.2 | 14.6 | 15.2 | 16.3 | 17.6 | 18.5 | 19.9 | 21 | 22.2 |
| Twin Falls | Twin Falls | µg/m³ | 19.1 | 18.7 | 18.7 | 18.7 | 19.1 | 18.4 | 17.9 | 17.5 | 17.8 | 18.5 | 18.3 | 17.8 |
