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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 | 36.8 | 14.8 | 16.7 | 18.7 | 20.5 | 22.3 | 24.3 | 26.2 | 28.1 | 29.2 | 31 | 32.5 | 33.2 | 33.7 | 34.2 | 34.7 | 35.5 | 36.5 | 36.8 | 36.6 | 36.3 | 35.8 | 35.8 | 35.7 | 34.9 |
| Boise | Idaho City | µg/m³ | 43 | 23.2 | 24.5 | 25.8 | 27.5 | 29.1 | 30.7 | 32.5 | 34.2 | 35.8 | 38.2 | 38.5 | 37.8 | 37.7 | 37.9 | 37.9 | 38.8 | 38.9 | 39.5 | 40.4 | 41.4 | 42.2 | 42.5 | 43 | 43 |
| Bonneville | Idaho Falls | µg/m³ | 15.1 | 6.3 | 6.7 | 7.2 | 7.5 | 8 | 8.4 | 9 | 9.9 | 10.3 | 10.4 | 10.7 | 10.9 | 11.3 | 11.5 | 11.8 | 12.3 | 13.1 | 13.6 | 14 | 14.2 | 14.3 | 14.6 | 14.9 | 15.1 |
| Boundary | Bonners Ferry | µg/m³ | 10.1 | 9.9 | 9.8 | 9.8 | 9.8 | 9.9 | 10 | 9.9 | 10.1 | 10 | 9.6 | 9.4 | 9.3 | 9.3 | 9 | 8.9 | 8.8 | 8.7 | 8.6 | 8.6 | 8.3 | 8.2 | 8 | 7.9 | 7.7 |
| Canyon | Nampa | µg/m³ | 32.3 | 25.1 | 25.6 | 26 | 26.5 | 27.1 | 27.2 | 27.3 | 27.3 | 27 | 25.8 | 24.9 | 25 | 25.2 | 24.8 | 24.2 | 24 | 24.8 | 25.8 | 26.9 | 28 | 29 | 30.2 | 31.2 | 32.3 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 9.6 | 9.5 | 9.6 | 9.3 | 9.4 | 9.3 | 9.4 | 8.7 | 8.8 | 8.8 | 8.8 | 8.9 | 8.7 | 9 | 9.5 | 9.5 | 9.6 | 9.4 | 9.5 | 9.4 | 9.2 | 9.2 | 9 | 9 | 8.9 |
| Idaho | Cottonwood | µg/m³ | 11.3 | 9.2 | 9.1 | 8.9 | 8.5 | 8.4 | 8.3 | 8.2 | 8.3 | 8.8 | 9.3 | 9.7 | 9.7 | 9.8 | 10 | 10 | 10.8 | 10.9 | 11.3 | 11.2 | 11.3 | 11.2 | 11.2 | 11.1 | 11 |
| Idaho | Grangeville | µg/m³ | 8.4 | 8.4 | 8.4 | 8 | 7.7 | 7.7 | 7.5 | 7.2 | 7.3 | 7.5 | 7.4 | 7.7 | 7.7 | 7.9 | 8.1 | 7.7 | 7.6 | 7.5 | 7.4 | 7.3 | 7.3 | 7.2 | 7.2 | 7.2 | 7.3 |
| Kootenai | Coeur d'Alene | µg/m³ | 13.3 | 13 | 13 | 13 | 12.9 | 12.9 | 12.9 | 13 | 13.2 | 13.1 | 13 | 13.1 | 13.3 | 13.2 | 13.3 | 13.2 | 12.7 | 12.2 | 11.7 | 11.7 | 11.3 | 10.8 | 10.5 | 10.4 | 10.1 |
| Latah | Juliaetta | µg/m³ | 12.1 | 9 | 9.2 | 9.3 | 9.2 | 9.3 | 9.5 | 9.3 | 9.9 | 10.9 | 11.8 | 11.6 | 12 | 12.1 | 11.8 | 11.5 | 11.3 | 11.2 | 10.9 | 10.7 | 10.4 | 10.3 | 10.4 | 10.4 | 10.3 |
| Lemhi | Salmon | µg/m³ | 18.7 | 14.4 | 14.7 | 14.8 | 15.2 | 15.1 | 15.5 | 15.7 | 16.1 | 16.5 | 16.8 | 17.2 | 17.8 | 18.2 | 18.4 | 18.6 | 18.7 | 18.3 | 18.2 | 18.5 | 18.4 | 18.2 | 18.4 | 18.2 | 18.1 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 12.7 | 7.1 | 7.1 | 7.2 | 7.5 | 7.4 | 7.2 | 7.4 | 7.5 | 7.7 | 8.2 | 8.6 | 8.9 | 9 | 9.1 | 9.1 | 9 | 9 | 9.3 | 12.4 | 12.7 | 12.7 | 12.6 | 12.6 | 12.4 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 8.1 | 7.1 | 7 | 6.7 | 6.7 | 6.9 | 6.9 | 6.7 | 7 | 7.2 | 7.2 | 7.5 | 7.6 | 7.9 | 8.1 | 7.9 | 7.6 | 7.7 | 7.7 | 7.9 | 7.7 | 7.7 | 7.6 | 7.8 | 8.1 |
| Nez Perce | Lewiston | µg/m³ | 11.9 | 8.6 | 8.7 | 8.9 | 9 | 9.1 | 9.3 | 9.4 | 9.4 | 10.3 | 10.9 | 11.1 | 11.3 | 11.6 | 11.8 | 11.8 | 11.9 | 11.7 | 11.6 | 11.5 | 11.5 | 11.6 | 11.5 | 11.5 | 11.6 |
| Shoshone | Pinehurst | µg/m³ | 14.2 | 14.2 | 13.9 | 13.4 | 12.9 | 12.8 | 12.6 | 12.4 | 12.2 | 12.1 | 12.1 | 11.8 | 11.8 | 11.5 | 11.2 | 11.1 | 10.8 | 10.7 | 10.5 | 10.4 | 10.3 | 10.1 | 10 | 9.9 | 9.6 |
| Twin Falls | Twin Falls | µg/m³ | 51.8 | 39.2 | 41.1 | 42.7 | 44.5 | 46.5 | 47.9 | 49.3 | 50 | 51.1 | 51.5 | 51.5 | 51.8 | 51.8 | 51.1 | 50.6 | 51 | 51.5 | 51.2 | 50.3 | 50 | 50 | 50 | 49.2 | 48.5 |
