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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 | 9.2 | 9.2 | 8.9 | 8.5 | 8.2 | 7.8 | 7.5 | 7.4 | 7 | 6.7 | 6.3 | 5.9 | 5.2 | 4.4 | 3.9 | 3.5 | 3.2 | 3.1 | 3.1 | 2.8 | 2.4 | 1.7 | 1.3 | 1 | 0.8 |
| Benewah | St Maries PM2.5 | µg/m³ | 26.7 | 25 | 25.9 | 26.2 | 25.9 | 26 | 25.8 | 25.9 | 26 | 26.3 | 26.2 | 26 | 25.7 | 25.2 | 25.2 | 25.4 | 26 | 26.7 | 26.2 | 25.5 | 25.9 | 24.9 | 25.4 | 23.6 | 22.8 |
| Boise | Idaho City | µg/m³ | 11 | 10.6 | 10.5 | 10.8 | 10.7 | 10.9 | 10.9 | 10.7 | 10.7 | 10.7 | 10.6 | 10.8 | 10.8 | 10.7 | 10.7 | 10.7 | 10.7 | 10.8 | 10.7 | 10.9 | 11 | 10.8 | 10.3 | 10.2 | 10.5 |
| Bonner | Sandpoint | µg/m³ | 12.9 | 12.9 | 12.7 | 12.5 | 12.6 | 12.5 | 12.5 | 12.3 | 12.1 | 11.7 | 11.5 | 11 | 10.7 | 10.7 | 10.6 | 10.4 | 10.2 | 10.2 | 10.3 | 10.3 | 10.2 | 10.3 | 10.1 | 9.8 | 9.9 |
| Bonneville | Idaho Falls | µg/m³ | 3.4 | 3.4 | 3.1 | 2.8 | 2.6 | 2.5 | 2.4 | 2.3 | 2.2 | 1.9 | 2.1 | 2.1 | 2 | 1.7 | 1.6 | 1.3 | 0.9 | 0.6 | 0.4 | 0.2 | 0 | -0.1 | -0.4 | -0.5 | -0.5 |
| Boundary | Bonners Ferry | µg/m³ | 3.4 | 3.3 | 3.4 | 3.1 | 3 | 3.3 | 3.4 | 3.3 | 3.2 | 3.2 | 3 | 3 | 2.9 | 2.7 | 2.5 | 2.8 | 2.5 | 2.6 | 2.3 | 2.5 | 2.3 | 2.5 | 2.5 | 2.5 | 2.5 |
| Canyon | Nampa | µg/m³ | 7.4 | 7.4 | 7.2 | 7 | 6.7 | 6.5 | 6.7 | 6.9 | 6.9 | 6.9 | 6.7 | 6.5 | 5.9 | 5.4 | 5 | 4.8 | 4.6 | 4.4 | 4.4 | 4.5 | 4.6 | 4.9 | 5.4 | 5.9 | 6.2 |
| Idaho | Grangeville | µg/m³ | 6.9 | 5.4 | 5.4 | 5.8 | 6.1 | 6.4 | 6.5 | 6.9 | 6.8 | 6.8 | 6.9 | 6.9 | 6.9 | 6.6 | 6.9 | 6.7 | 6.5 | 6.8 | 6.9 | 6.7 | 6.3 | 6.5 | 6.3 | 6.2 | 5.9 |
| Kootenai | Coeur d'Alene | µg/m³ | 13.3 | 12.3 | 12.7 | 12.8 | 13.2 | 13.3 | 13.2 | 12.9 | 12.9 | 12.7 | 12.6 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12 | 12 | 12.1 | 12.1 | 12 | 11.9 |
| Lemhi | Salmon | µg/m³ | 22.4 | 22.4 | 22.1 | 21.7 | 21.4 | 21.3 | 20.9 | 20.8 | 20.5 | 20.1 | 19.9 | 20.2 | 20.4 | 20.8 | 20.7 | 20.4 | 20 | 19.7 | 19 | 17.9 | 17 | 15.3 | 13.9 | 12.9 | 12.7 |
| Nez Perce | Lewiston | µg/m³ | 18 | 10.8 | 10.2 | 9.4 | 9 | 8.6 | 8.5 | 8.2 | 8.3 | 8.2 | 8.8 | 11.4 | 12.7 | 13.5 | 14.2 | 14.9 | 15.2 | 15.6 | 16 | 16.5 | 16.8 | 17 | 17.3 | 17.7 | 18 |
| Shoshone | Pinehurst | µg/m³ | 23.3 | 20.9 | 20.7 | 20.3 | 20.6 | 20.7 | 20.4 | 21.3 | 21.7 | 22 | 22.2 | 22.2 | 22.2 | 22.1 | 22.2 | 22.4 | 22.3 | 22.1 | 22.1 | 22.2 | 22.5 | 22.5 | 22.9 | 22.6 | 23.3 |
| Twin Falls | Twin Falls | µg/m³ | 8.2 | 8.2 | 8.2 | 8.2 | 8 | 7.7 | 7.5 | 7.2 | 7 | 6.6 | 6.1 | 6 | 5.7 | 5.5 | 5.2 | 5 | 4.8 | 4.7 | 4.5 | 4.2 | 4.1 | 4 | 3.9 | 3.6 | 3.5 |
