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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 | 10.1 | 10.1 | 10.1 | 9.9 | 9.5 | 9.3 | 9 | 8.9 | 8.7 | 8.7 | 8.6 | 8.4 | 8.1 | 7.6 | 7.4 | 7.2 | 6.9 | 6.8 | 6.7 | 6.8 | 6.8 | 6.7 | 6.6 | 6.6 | 6.5 |
| Boise | Idaho City | µg/m³ | 49.6 | 49.6 | 47.8 | 46 | 44.6 | 43.1 | 41.5 | 39.7 | 37.6 | 35.7 | 34.4 | 30.6 | 28 | 27 | 26.1 | 26 | 26.8 | 27 | 27.2 | 27.6 | 27.3 | 26.2 | 24.9 | 23.6 | 22.5 |
| Bonneville | Idaho Falls | µg/m³ | 8.3 | 8.1 | 8.3 | 8.2 | 8.2 | 8.2 | 8 | 8 | 7.7 | 7.6 | 7.4 | 7.2 | 7.1 | 6.9 | 6.8 | 6.6 | 6.6 | 6.3 | 6.3 | 7.1 | 7 | 6.9 | 6.9 | 6.6 | 6.2 |
| Boundary | Bonners Ferry | µg/m³ | 5.3 | 2.8 | 3 | 2.8 | 2.7 | 3.1 | 3.4 | 3.3 | 3.2 | 3.1 | 3.2 | 3.4 | 3.5 | 3.7 | 3.7 | 3.9 | 3.9 | 3.8 | 4.1 | 4.3 | 4.4 | 4.6 | 4.7 | 5 | 5.3 |
| Canyon | Nampa | µg/m³ | 43.8 | 43.8 | 41.2 | 38.6 | 36.4 | 34.7 | 33 | 31.5 | 30.3 | 29 | 27.7 | 26.3 | 24.7 | 23.5 | 22 | 20.5 | 19.3 | 18.3 | 17.4 | 16.5 | 15.6 | 15.1 | 13.9 | 13 | 11.9 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 21.1 | 20.4 | 21.1 | ||||||||||||||||||||||
| Idaho | Cottonwood | µg/m³ | 31.5 | 24.4 | 25.6 | 26.8 | 28.1 | 29.3 | 30.5 | 31.5 | 31.5 | 31 | 29.8 | 28.2 | 27.7 | 27.7 | 28.3 | 28.7 | 28.3 | 27.8 | 27.6 | 27.8 | 28 | 27.4 | 27.6 | 27.3 | 26.8 |
| Idaho | Grangeville | µg/m³ | 36.8 | 27.9 | 29.1 | 30.2 | 31.3 | 32.4 | 33.1 | 33.8 | 34.7 | 35.6 | 35.6 | 35.4 | 36.1 | 36.6 | 36.8 | 36.4 | 35.7 | 34.8 | 34.2 | 33.7 | 32.9 | 31.7 | 30.2 | 29 | 27.9 |
| Kootenai | Coeur d'Alene | µg/m³ | 10.2 | 3.3 | 3.3 | 3.4 | 3.4 | 3.5 | 3.7 | 3.7 | 3.7 | 3.7 | 3.9 | 4 | 4.1 | 4.2 | 4.7 | 5.3 | 5.8 | 6.2 | 6.7 | 7.5 | 7.9 | 8.5 | 9.1 | 9.7 | 10.2 |
| Latah | Juliaetta | µg/m³ | 21.7 | 14.8 | 14.9 | 15.2 | 15.4 | 15.5 | 15.6 | 16 | 16 | 16.1 | 16.1 | 15.2 | 14.8 | 14.7 | 15.2 | 16.9 | 18.9 | 19.9 | 20.8 | 21.3 | 21.4 | 21.6 | 21.6 | 21.7 | 21.5 |
| Lemhi | Salmon | µg/m³ | 49.3 | 37.5 | 37.9 | 38.4 | 38.8 | 39.1 | 39.5 | 39.9 | 40.1 | 40.8 | 41.2 | 42 | 42.7 | 43.8 | 45.3 | 47.5 | 48.5 | 49.1 | 49.2 | 49.1 | 49.3 | 48.9 | 47.8 | 46.6 | 44.7 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 17.2 | 16.8 | 17.2 | ||||||||||||||||||||||
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 55.1 | 42.7 | 43.6 | 44.5 | 45.8 | 47.1 | 48.1 | 49.5 | 50.7 | 51.8 | 52.3 | 51.6 | 50.7 | 48.8 | 49 | 50.6 | 51.8 | 53.2 | 54 | 54.7 | 55.1 | 52.8 | 50.5 | 48.1 | 46.7 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 22.1 | 12.8 | 12.5 | 12.5 | 12.5 | 12.8 | 13 | 13.4 | 13.9 | 14.3 | 15 | 15.4 | 16 | 16.7 | 18.1 | 19.5 | 20.7 | 21.3 | 21.5 | 22.1 | 21.7 | 21.6 | 21.3 | 21.1 | 20.9 |
| Nez Perce | Lewiston | µg/m³ | 23.6 | 13.5 | 13.7 | 14 | 14.5 | 14.8 | 15.2 | 15.5 | 16 | 16 | 16.5 | 17.1 | 18.2 | 19 | 19.9 | 20.7 | 22 | 22.1 | 22.7 | 23.6 | 23.1 | 22.9 | 22.6 | 22.6 | 22.3 |
| Shoshone | Pinehurst | µg/m³ | 11.5 | 3.8 | 3.8 | 3.8 | 3.9 | 3.9 | 4.1 | 4.3 | 4.4 | 4.3 | 4.4 | 4.5 | 4.5 | 4.6 | 4.9 | 5.5 | 6.1 | 6.9 | 7.7 | 8.6 | 9.2 | 9.7 | 10.2 | 11 | 11.5 |
| Twin Falls | Twin Falls | µg/m³ | 14.1 | 14.1 | 13.9 | 13.4 | 13 | 12.6 | 12.2 | 12.1 | 11.8 | 11.5 | 11.4 | 11.4 | 11.6 | 11.5 | 11.3 | 11.1 | 10.9 | 10.8 | 10.6 | 10.3 | 10 | 10.5 | 10.9 | 11.1 | 11.3 |
