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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 | 8.9 | 8.9 | 8.6 | 8.5 | 8.5 | 8.2 | 8.2 | 8 | 7.7 | 7.4 | 7.2 | 7 | 6.9 | 6.8 | 6.4 | 6.2 | 6 | 5.9 | 6 | 6.1 | 6.5 | 6.7 | 7 | 7.2 | 7.3 |
| Boise | Idaho City | µg/m³ | 12 | 12 | 11.6 | 11.4 | 11 | 10.7 | 10.2 | 9.7 | 9.2 | 9.1 | 9.1 | 9.2 | 9.3 | 9.5 | 9.5 | 9.4 | 9.2 | 9 | 9 | 8.8 | 9.2 | 9.2 | 9.2 | 9.5 | 9.8 |
| Bonner | Sandpoint | µg/m³ | 6 | 4.5 | 4.7 | 4.8 | 4.8 | 5 | 5.1 | 5 | 5 | 5.2 | 5.3 | 5.2 | 5.2 | 5.5 | 5.7 | 5.8 | 5.8 | 6 | 5.9 | 5.8 | 5.5 | 5.5 | 5.6 | 5.7 | 5.8 |
| Bonneville | Idaho Falls | µg/m³ | 6.9 | 6.9 | 6.6 | 6.3 | 6.2 | 6.2 | 6 | 5.9 | 5.7 | 5.5 | 5.1 | 4.9 | 4.7 | 4.5 | 4.5 | 4.4 | 4.4 | 4.7 | 4.7 | 5 | 5.3 | 5.7 | 5.9 | 6.1 | 6.1 |
| Boundary | Bonners Ferry | µg/m³ | 2.6 | 2.3 | 2.4 | 2.5 | 2.4 | 2.3 | 2.4 | 2.2 | 2 | 2 | 2 | 2.3 | 2.1 | 2.3 | 2.4 | 2.3 | 2.2 | 2.2 | 2.4 | 2.2 | 2.2 | 2.2 | 2.3 | 2.5 | 2.6 |
| Canyon | Nampa | µg/m³ | 20 | 15.4 | 15.7 | 16 | 16 | 16.1 | 16.2 | 16.2 | 16.4 | 16.2 | 16.2 | 16.2 | 16.2 | 16.5 | 16.4 | 16.4 | 16.7 | 17.2 | 17.6 | 18.1 | 18.6 | 19.1 | 19.3 | 19.4 | 20 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 10 | 6.9 | 6.8 | 7.1 | 7.4 | 7.9 | 8.2 | 8.4 | 8.4 | 8.8 | 8.8 | 9.2 | 9.3 | 9.6 | 9.8 | 10 | 9.8 | 9.7 | 9.3 | 9.2 | 9.1 | 8.6 | 8.7 | 9 | 9.2 |
| Idaho | Cottonwood | µg/m³ | 11.6 | 9.2 | 9.4 | 9.3 | 9.5 | 9.8 | 10.1 | 10.3 | 10.6 | 11.2 | 11.3 | 11.1 | 11.2 | 11.4 | 11.3 | 11.4 | 11.4 | 11.6 | 11.3 | 11.2 | 10.9 | 10.3 | 9.5 | 8.8 | 8.2 |
| Idaho | Grangeville | µg/m³ | 7.5 | 5.2 | 5.5 | 5.6 | 5.8 | 5.9 | 5.7 | 5.5 | 5.9 | 5.9 | 5.8 | 6 | 6.3 | 6.5 | 6.6 | 6.8 | 6.9 | 7.1 | 7.2 | 7.3 | 7.5 | 7.2 | 7 | 7 | 6.8 |
| Kootenai | Coeur d'Alene | µg/m³ | 8 | 7.9 | 7.8 | 7.7 | 7.7 | 7.9 | 7.7 | 7.6 | 7.4 | 7.4 | 7.5 | 7.7 | 7.8 | 8 | 7.8 | 7.7 | 7.6 | 7.7 | 7.5 | 7.4 | 7.3 | 7.2 | 7 | 6.7 | 6.2 |
| Latah | Juliaetta | µg/m³ | 8.2 | 4.7 | 4.8 | 4.9 | 4.9 | 5.1 | 5.4 | 5.7 | 5.4 | 6.1 | 6.5 | 6.5 | 7 | 7.2 | 7 | 7.6 | 8.2 | 7.9 | 7.7 | 7.5 | 7.6 | 7.7 | 7.9 | 7.9 | 8 |
| Lemhi | Salmon | µg/m³ | 37.5 | 37.5 | 36.9 | 36.5 | 35.7 | 35.2 | 34.5 | 34 | 33.5 | 33 | 32.7 | 32.4 | 32.2 | 32.1 | 31.8 | 31.8 | 31.7 | 32 | 32.2 | 32.4 | 32.8 | 32.8 | 32.9 | 33 | 32.9 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 8.7 | 5.1 | 5.5 | 6.2 | 6.3 | 6.7 | 6.8 | 7 | 7.2 | 7.3 | 7.6 | 7.7 | 8.1 | 8.1 | 8.2 | 8 | 8.1 | 8.5 | 8.5 | 8.4 | 8.7 | 8.6 | 8.7 | 8.5 | 8.6 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 8.1 | 5.5 | 5.7 | 5.2 | 5.5 | 5.6 | 5.9 | 5.8 | 5.8 | 5.5 | 5.7 | 6 | 6.5 | 6.7 | 7 | 7.1 | 7.5 | 7.5 | 7.4 | 7.4 | 7.5 | 7.6 | 7.8 | 7.9 | 8.1 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 7.4 | 4.4 | 4.6 | 5 | 5.1 | 5.3 | 5.7 | 5.9 | 5.8 | 5.9 | 6.1 | 5.5 | 6.5 | 6.8 | 7.2 | 7.4 | 7.1 | 7.2 | 7 | 7 | 7.3 | 7 | 7.2 | 7.1 | 7.1 |
| Nez Perce | Lewiston | µg/m³ | 12.2 | 7.3 | 7.5 | 7.7 | 8.1 | 8.5 | 8.7 | 9.2 | 9.2 | 9.9 | 10.5 | 11 | 11.2 | 11.5 | 11.7 | 11.9 | 12 | 12.2 | 12.1 | 12 | 11.8 | 11.5 | 11.7 | 11.8 | 11.7 |
| Shoshone | Pinehurst | µg/m³ | 11.9 | 10.7 | 10.8 | 10.8 | 10.7 | 10.7 | 10.6 | 10.6 | 10.7 | 10.8 | 10.9 | 10.9 | 11 | 11.1 | 11.4 | 11.4 | 11.3 | 11.5 | 11 | 10.9 | 10.9 | 11.1 | 11.8 | 11.9 | 11.9 |
| Twin Falls | Twin Falls | µg/m³ | 10.4 | 8.6 | 8.6 | 8.7 | 9 | 9.1 | 9.5 | 9.3 | 9.2 | 9 | 9.3 | 9.2 | 9.2 | 9.2 | 9.3 | 9.5 | 9.7 | 10 | 10.4 | 10.4 | 10.2 | 9.7 | 9.5 | 9.3 | 9.1 |
