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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 | 11.2 | 11.2 | 11.2 | 11 | 10.9 | 10.8 | 10.9 | 10.7 | 10.6 | 10.3 | 10.1 | 9.9 | 9.5 | 9.1 | 8.8 | 8.4 | 8 | 7.9 | 7.8 | 7.4 | 7.2 | 7 | 6.8 | 6.7 | 6.6 |
| Boise | Idaho City | µg/m³ | 20 | 20 | 20 | 19.8 | 19.7 | 19.2 | 19.2 | 19 | 18.8 | 18.7 | 17.3 | 17.2 | 17 | 17 | 16.7 | 16.7 | 16.4 | 16.3 | 16.1 | 16.2 | 15.5 | 14.4 | 13.7 | 13.6 | 13.1 |
| Bonner | Sandpoint | µg/m³ | 45.4 | 36.7 | 36.9 | 37.1 | 37.7 | 37.9 | 38.1 | 38 | 38.2 | 38.3 | 38.4 | 39.2 | 39.2 | 39 | 39.5 | 40.3 | 40.7 | 41.5 | 42.2 | 42.9 | 43.1 | 43.8 | 44.5 | 45.2 | 45.4 |
| Bonneville | Idaho Falls | µg/m³ | 9.4 | 9 | 9.2 | 9.3 | 9.3 | 9.4 | 9.3 | 9.3 | 9.2 | 8.9 | 8.6 | 8.2 | 8.2 | 7.9 | 8 | 8.1 | 7.8 | 7.8 | 8.2 | 7.7 | 7.7 | 7.7 | 8 | 8.1 | 8.1 |
| Boundary | Bonners Ferry | µg/m³ | 31.2 | 31.2 | 30.9 | 30.5 | 30.5 | 29.8 | 29.6 | 29.4 | 29.3 | 29.2 | 28.6 | 28 | 27.6 | 27.7 | 27.7 | 27 | 26.6 | 26.5 | 26.3 | 26.1 | 26 | 25.9 | 25.8 | 25.3 | 25 |
| Boundary | Mt Hall | µg/m³ | 28.2 | 28.2 | 28.2 | 28 | 28 | 27.8 | 27.4 | 27.2 | 26.8 | 26.7 | 26.9 | 27 | 27.2 | 26.8 | 26.5 | 26.2 | 26 | 26.2 | 26.1 | 26 | 26 | 25.8 | 25.4 | 25 | 24.7 |
| Boundary | Porthill | µg/m³ | 25.3 | 22.1 | 22.4 | 22.8 | 22.9 | 23.2 | 23.4 | 23.7 | 24.1 | 24.5 | 24.6 | 24.4 | 24.2 | 24.3 | 24.2 | 24.3 | 24.1 | 24.5 | 24.6 | 24.6 | 24.8 | 24.9 | 25.3 | 25.3 | 25.3 |
| Canyon | Nampa | µg/m³ | 17.5 | 8.3 | 8.3 | 8.4 | 8.6 | 8.7 | 8.6 | 8.4 | 8.2 | 8.4 | 8.4 | 8.4 | 8.4 | 8.5 | 9.1 | 9.7 | 10.2 | 10.7 | 11.4 | 12.2 | 13 | 13.9 | 14.7 | 16.2 | 17.5 |
| Franklin | Preston | µg/m³ | 8.1 | 5 | 5.2 | 5.3 | 5.5 | 5.7 | 5.7 | 5.7 | 5.9 | 5.8 | 5.9 | 6.1 | 6.2 | 6.6 | 7 | 7.2 | 7.5 | 7.7 | 7.1 | 7.1 | 7.2 | 7.2 | 7.6 | 8.1 | 8.1 |
| Idaho | Grangeville | µg/m³ | 7 | 7 | 6.9 | 6.7 | 6.6 | 6.4 | 6.3 | 6.1 | 6.1 | 6.6 | 6.2 | 6 | 5.9 | 6 | 6.1 | 6.4 | 6.3 | 6.2 | 6 | 6.1 | 6.5 | 6.3 | 6 | 7 | 6.8 |
| Kootenai | Coeur d'Alene | µg/m³ | 38.9 | 38.7 | 38.8 | 38.9 | 38.6 | 38.5 | 38.4 | 38.3 | 38.1 | 37.6 | 37 | 36.5 | 35.2 | 34.6 | 32.8 | 30.9 | 28.9 | 27.6 | 26.6 | 26.2 | 26 | 26.6 | 27.4 | 28.6 | 29.4 |
| Latah | Juliaetta | µg/m³ | 24.2 | 24.2 | 22.8 | 21.6 | 20.3 | 18.8 | 17.5 | 16.2 | 15.1 | 14.1 | 12.9 | 12 | 12 | 12.1 | 12.6 | 12.7 | 13.7 | 14.2 | 14.6 | 15.6 | 17.9 | 18.5 | 19.2 | 19.5 | 19.2 |
| Lemhi | Salmon | µg/m³ | 9.4 | 6.8 | 6.3 | 6 | 5.9 | 6.2 | 6.2 | 6.3 | 6.4 | 6.3 | 6.4 | 6.3 | 6.2 | 6.3 | 6.5 | 6.7 | 6.7 | 6.6 | 6.8 | 6.8 | 6.8 | 7.5 | 8.5 | 9.2 | 9.4 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 14.3 | 14.3 | 13.7 | 13.7 | 13.1 | 12.7 | 12.4 | 12.1 | 11.4 | 10.9 | 10.6 | 10.3 | 10.4 | 10.2 | 9.9 | 9.4 | 10.1 | 10.1 | 10.2 | 10.3 | 10.4 | 10 | 10.7 | 10.6 | 11 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 21 | 18.7 | 18.7 | 18.7 | 18.5 | 18.4 | 18.3 | 18.2 | 18.2 | 18.2 | 17.7 | 17.7 | 17.7 | 18.2 | 19.3 | 20 | 20.4 | 20.3 | 20.2 | 20.1 | 20.3 | 20.7 | 20.9 | 20.7 | 21 |
| Nez Perce | Lewiston | µg/m³ | 36.7 | 36 | 36.2 | 36.1 | 36.2 | 36.1 | 36.2 | 36.2 | 36 | 36.7 | 36.5 | 36.6 | 35.6 | 34.8 | 34 | 33.9 | 34.2 | 34.2 | 33.4 | 29.9 | 28 | 27.7 | 27.2 | 26.7 | 26.8 |
| Shoshone | Pinehurst | µg/m³ | 25.9 | 25.9 | 25.2 | 25.1 | 25.1 | 25 | 24.5 | 24.2 | 23.6 | 23.2 | 23.1 | 22.8 | 22.2 | 22.1 | 21.9 | 21.9 | 21.8 | 21.1 | 20.8 | 19.2 | 18.5 | 17.8 | 17.7 | 17.6 | 17.6 |
| Twin Falls | Twin Falls | µg/m³ | 8 | 4.8 | 5 | 5.1 | 5.2 | 5.6 | 5.7 | 5.6 | 5.6 | 5.6 | 5.5 | 5.7 | 5.8 | 5.9 | 6 | 6.1 | 6.2 | 6.3 | 6.4 | 6.6 | 7 | 7.4 | 7.6 | 7.9 | 8 |
