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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 | 8.5 | 8.5 | 8.5 | 8.3 | 8.2 | 8.1 | 7.9 | 7.7 | 7.5 | 7.2 | 7 | 6.9 | 6.4 | 6 | 5.8 | 5.7 | 5.9 | 6 | 6.1 | 6.1 | 6.2 | 6.3 | 6.2 | 6.1 | 6.2 |
| Boise | Idaho City | µg/m³ | 6.1 | 4.6 | 4.6 | 4.7 | 4.8 | 4.9 | 5 | 5 | 5.1 | 5.3 | 5.3 | 5.2 | 5.3 | 5.6 | 5.6 | 5.6 | 5.6 | 5.7 | 5.6 | 5.6 | 6 | 6.1 | 6.1 | 6 | 6.1 |
| Bonner | Sandpoint | µg/m³ | 7.4 | 5.8 | 6 | 6.3 | 6.3 | 6.3 | 6.3 | 6.5 | 6.6 | 6.7 | 6.8 | 7 | 7 | 7.1 | 7.1 | 7.2 | 7.3 | 7.4 | 7.3 | 7.1 | 6.9 | 6.7 | 6.5 | 6.6 | 6.6 |
| Bonneville | Idaho Falls | µg/m³ | 18.3 | 12.3 | 12.9 | 13.8 | 14.7 | 15.3 | 16.3 | 16.9 | 17.2 | 17.5 | 18 | 18.2 | 18.3 | 18.2 | 17.3 | 15.5 | 13.8 | 13.3 | 12.9 | 12.6 | 12.5 | 12.6 | 12.3 | 12.2 | 11.7 |
| Boundary | Bonners Ferry | µg/m³ | 2.6 | 2.4 | 2.5 | 2.3 | 2.2 | 2.1 | 1.8 | 1.7 | 1.4 | 1.6 | 1.7 | 1.7 | 2.5 | 2.3 | 2.6 | 2.4 | 2.3 | 2.2 | 2.5 | 2.3 | 2.4 | 2.3 | 2.2 | 2.1 | 2.3 |
| Canyon | Nampa | µg/m³ | 9.6 | 8.9 | 8.6 | 8.3 | 8.1 | 7.9 | 7.9 | 7.9 | 7.9 | 8.1 | 8.1 | 8.1 | 8.2 | 8.3 | 8.2 | 8.3 | 8.9 | 9 | 8.7 | 8.7 | 9.3 | 9.6 | 9.5 | 9.6 | 9.6 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 9.5 | 5.5 | 5.5 | 5.7 | 5.7 | 5.8 | 5.9 | 6 | 6.1 | 6.3 | 6.2 | 6.3 | 6.3 | 6.4 | 6.3 | 6.3 | 6.6 | 7 | 7.4 | 7.4 | 8 | 8.1 | 9.1 | 9.5 | 9.2 |
| Idaho | Cottonwood | µg/m³ | 9.5 | 9 | 9.2 | 9.1 | 9.2 | 9.5 | 9.5 | 9.4 | 9.1 | 9.2 | 9.1 | 9.4 | 9.2 | 9.2 | 8.9 | 8.4 | 8.7 | 8.4 | 8.2 | 8.2 | 8.3 | 8.3 | 8.4 | 8.2 | 8.5 |
| Idaho | Grangeville | µg/m³ | 6.4 | 5.1 | 5.1 | 4.9 | 5.2 | 5.4 | 5.5 | 5.4 | 5.6 | 5.6 | 6 | 6 | 6 | 6 | 6.3 | 6.3 | 6.2 | 6.2 | 6.2 | 6.3 | 6.3 | 6.3 | 6.4 | 6.4 | 6.4 |
| Kootenai | Coeur d'Alene | µg/m³ | 6.4 | 5.9 | 6 | 6.2 | 6.2 | 6.2 | 6.2 | 6.1 | 6 | 5.9 | 5.8 | 6.2 | 6.2 | 6 | 6.1 | 6.2 | 6.3 | 6.4 | 6 | 5.2 | 5.1 | 5 | 4.9 | 4.9 | 4.9 |
| Latah | Juliaetta | µg/m³ | 7.7 | 6.4 | 6.4 | 6.5 | 6.5 | 6.3 | 6.1 | 5.9 | 5.5 | 5.1 | 4.9 | 5.2 | 5.4 | 5.9 | 6 | 6.2 | 6.1 | 6.6 | 7 | 7 | 7 | 7.1 | 7.2 | 7.3 | 7.7 |
| Lemhi | Salmon | µg/m³ | 64.8 | 64.8 | 63.8 | 63.1 | 62.6 | 61.7 | 60.6 | 59.8 | 58.7 | 57.5 | 56.8 | 56.2 | 55.3 | 54.5 | 53.5 | 52.5 | 51.6 | 50.5 | 49.2 | 47.7 | 46.2 | 44.7 | 43.5 | 42.4 | 41.4 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 8 | 7.7 | 8 | 7.9 | 8 | 8 | 8 | 8 | 7.7 | 7.9 | 7.7 | 7.9 | 7.7 | 7.8 | 7.5 | 6.7 | 6.2 | 6.5 | 6.2 | 6.1 | 5.9 | 5.4 | 5.4 | 5 | 4.9 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 7.1 | 5.7 | 5.7 | 5.5 | 6.2 | 6.6 | 6.5 | 5.9 | 6.2 | 6.5 | 6.4 | 6.3 | 6.6 | 6.7 | 7.1 | 6.9 | 6.6 | 6.7 | 6.7 | 6.7 | 6.8 | 6.7 | 6.7 | 6.8 | 6.7 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 8.3 | 6.4 | 6.5 | 6.7 | 6.8 | 6.7 | 6.8 | 7 | 7.1 | 7 | 7.3 | 7.4 | 7.5 | 7.7 | 8 | 8 | 8.3 | 8.3 | 8.2 | 8.3 | 8.2 | 8.1 | 8.3 | 8.2 | 8.1 |
| Nez Perce | Lewiston | µg/m³ | 12.4 | 10.5 | 10.4 | 10.3 | 10.3 | 10.2 | 10 | 10 | 10.2 | 9.1 | 10 | 10.5 | 10.5 | 10.5 | 10.2 | 10.4 | 10.4 | 10.7 | 11 | 11.1 | 11.3 | 11.3 | 11.6 | 12 | 12.4 |
| Shoshone | Pinehurst | µg/m³ | 8.7 | 8.5 | 8.3 | 8.2 | 7.8 | 7.9 | 7.7 | 7.2 | 7.3 | 7.3 | 7.2 | 7.2 | 7.3 | 7.4 | 7.6 | 7.7 | 7.9 | 8.1 | 8.3 | 8.4 | 8.6 | 8.6 | 8.5 | 8.7 | 8.6 |
| Twin Falls | Twin Falls | µg/m³ | 9.2 | 4.7 | 5.1 | 5.5 | 5.7 | 5.8 | 5.9 | 5.9 | 6 | 6 | 6 | 6.2 | 6.5 | 6.7 | 6.9 | 7 | 7.2 | 7.6 | 8 | 8.5 | 8.6 | 9 | 9.2 | 9.2 | 9 |
