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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 | 11.7 | 11.7 | 11.2 | 10.5 | 9.9 | 9.3 | 8.9 | 8.3 | 8 | 7.8 | 7.5 | 7.3 | 7 | 6.9 | 6.7 | 6.7 | 6.7 | 6.5 | 6.4 | 6.5 | 6.2 | 6.1 | 6.1 | 6.1 | 6.2 |
| Boise | Idaho City | µg/m³ | 10.6 | 8.2 | 8.3 | 8.5 | 8.5 | 8.5 | 8.7 | 8.7 | 8.8 | 8.9 | 9.1 | 9.4 | 9.5 | 9.7 | 10.2 | 10.6 | 10.6 | 10.4 | 10.1 | 9.9 | 9 | 8.5 | 7.9 | 7.4 | 7 |
| Bonner | Sandpoint | µg/m³ | 5.5 | 5.4 | 5.5 | 5.4 | 5.3 | 5.4 | 5.3 | 5.1 | 5.2 | 5.4 | 5.1 | 4.7 | 4.7 | 4.8 | 4.9 | 5 | 5 | 5 | 5 | 4.8 | 4.7 | 4.6 | 4.6 | 4.5 | 4.4 |
| Bonneville | Idaho Falls | µg/m³ | 8.8 | 8.8 | 8.8 | 8.4 | 7.9 | 7.3 | 6.8 | 6.5 | 6 | 5.8 | 5.7 | 5.5 | 5.5 | 5.2 | 5.2 | 5.1 | 5.1 | 5.2 | 5.1 | 5.2 | 5.3 | 5.6 | 5.5 | 5.4 | 5.4 |
| Boundary | Bonners Ferry | µg/m³ | 2.1 | 1.7 | 1.9 | 1.8 | 2 | 1.9 | 1.8 | 1.9 | 2 | 1.9 | 2 | 2 | 1.8 | 1.7 | 1.8 | 1.7 | 2 | 2.1 | 1.8 | 1.7 | 1.6 | 1.7 | 1.7 | 1.7 | 1.6 |
| Canyon | Nampa | µg/m³ | 7.8 | 4.6 | 4.6 | 4.7 | 4.9 | 5.1 | 5.2 | 5.4 | 5.5 | 5.6 | 5.8 | 6.1 | 6.4 | 6.7 | 6.7 | 6.8 | 7.1 | 7.2 | 7.4 | 7.7 | 7.7 | 7.8 | 7.8 | 7.6 | 7.6 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 2.9 | 2.1 | 2.2 | 2 | 1.9 | 1.7 | 1.3 | 1.3 | 1.3 | 1.2 | 1.1 | 1.4 | 1.7 | 1.6 | 1.5 | 2.1 | 2 | 2.1 | 2.5 | 2.5 | 2.5 | 2.9 | 2.9 | 2.8 | 2.7 |
| Idaho | Cottonwood | µg/m³ | 4.9 | 2.3 | 2.3 | 2.3 | 2.4 | 2.5 | 2.4 | 2.5 | 2.3 | 2.4 | 2.6 | 2.6 | 2.7 | 2.7 | 2.7 | 2.8 | 3.1 | 3 | 3.2 | 3.5 | 3.9 | 3.9 | 4.1 | 4.2 | 4.9 |
| Idaho | Grangeville | µg/m³ | 3 | 0 | 0 | 0 | 0 | -0.3 | -0.1 | 0 | 0.2 | 0.1 | 0.3 | 0.5 | 0.8 | 1 | 1.1 | 1.4 | 1.7 | 1.9 | 2.1 | 2.4 | 2.5 | 2.6 | 2.7 | 2.9 | 3 |
| Kootenai | Coeur d'Alene | µg/m³ | 6.9 | 4.5 | 4.7 | 5.1 | 5.2 | 5.4 | 5.7 | 5.9 | 6 | 6.2 | 6.2 | 6.3 | 6.5 | 6.6 | 6.5 | 6.4 | 6.3 | 6.3 | 6.6 | 6.9 | 6.8 | 6.7 | 6.5 | 6.3 | 5.9 |
| Latah | Juliaetta | µg/m³ | 4 | 2.4 | 2.5 | 2.6 | 2.4 | 2 | 2.1 | 1.9 | 2 | 1.8 | 1.7 | 1.8 | 1.9 | 1.6 | 1.8 | 2 | 1.8 | 2 | 2.1 | 2.6 | 2.9 | 3 | 3.4 | 3.8 | 4 |
| Lemhi | Salmon | µg/m³ | 101.4 | 60.1 | 63.7 | 67.3 | 71 | 74.6 | 78.5 | 82.1 | 85.6 | 89.3 | 92.8 | 96 | 99.7 | 101.4 | 100.7 | 98.6 | 95.5 | 93.1 | 91.3 | 90.8 | 90.6 | 90.7 | 90.6 | 90.5 | 90 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 2.9 | 0 | -0.1 | -0.3 | -0.1 | 0 | 0 | -0.2 | -0.1 | -0.2 | 0 | 0 | 0.1 | 0.4 | 0.5 | 0.9 | 0.9 | 1.2 | 1.8 | 1.8 | 2 | 2.3 | 2.4 | 2.9 | 2.8 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 5.2 | 5.2 | 5 | 4.9 | 4.8 | 4.4 | 3.9 | 3.7 | 3.7 | 3.4 | 3.4 | 3.2 | 1.6 | 2 | 2.6 | 2.7 | 3.1 | 3.2 | 3.4 | 3.4 | 3.3 | 3.5 | 3.4 | 3.4 | 3.4 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 3.4 | 1.9 | 2 | 1.9 | 1.7 | 1.7 | 1.7 | 1.7 | 2.3 | 1.7 | 1.9 | 1.9 | 2.1 | 2.1 | 2.3 | 2.4 | 2.7 | 2.7 | 2.9 | 3 | 3.1 | 3.2 | 3.4 | 3 | 3.2 |
| Nez Perce | Lewiston | µg/m³ | 4.8 | 3.9 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | 3.8 | 3.8 | 3.6 | 3.6 | 3.7 | 3.6 | 3.6 | 3.8 | 4 | 3.8 | 4 | 4.1 | 4.4 | 4.7 | 4.8 | 4.7 | 4.8 |
| Shoshone | Pinehurst | µg/m³ | 7.2 | 7.2 | 7.1 | 7 | 7 | 6.8 | 6.5 | 6.4 | 6.4 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.4 | 6.3 | 6.2 | 5.9 | 6.1 | 6.2 | 6.5 | 6.7 |
| Twin Falls | Twin Falls | µg/m³ | 6.7 | 6.7 | 6.5 | 6.2 | 6.2 | 6.1 | 6 | 5.9 | 5.9 | 6 | 6 | 6.2 | 6.3 | 6.3 | 6.4 | 6.4 | 6.3 | 6.2 | 6 | 6 | 5.8 | 5.6 | 5.5 | 5.5 | 5.4 |
