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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 | 39.5 | 39.4 | 39.5 | 39.4 | 37.7 | 36.2 | 34.4 | 31.5 | 28.4 | 26.3 | 26.3 | 22 | 18.5 | 16.7 | 15.7 | 15.1 | 14.3 | 13.5 | 12.6 | 11.6 | 10.8 | 10 | 9.3 | 8.5 | 7.6 |
| Benewah | St Maries PM2.5 | µg/m³ | 12.6 | 11.1 | 11.2 | 11.2 | 11.5 | 11.5 | 12.2 | 12.5 | 12.6 | 12.4 | 12.4 | 12.5 | 12.6 | 12.5 | 12.3 | 12.2 | 12.2 | 11.2 | 10 | 9.1 | 8 | 7.6 | 7.1 | 7 | 6.8 |
| Boise | Idaho City | µg/m³ | 25.7 | 11.7 | 11.7 | 11.8 | 11.9 | 12 | 11.8 | 11.2 | 11.2 | 11.1 | 11.4 | 12.6 | 14.5 | 15.7 | 16.5 | 17.3 | 18.3 | 19.6 | 20.5 | 21.6 | 23.4 | 24.5 | 25.1 | 25.3 | 25.7 |
| Bonner | Sandpoint | µg/m³ | 21.4 | 21.2 | 21.1 | 21.1 | 21.1 | 21.3 | 21.2 | 21.4 | 21.1 | 21.1 | 21.1 | 21 | 20.7 | 20.5 | 20.5 | 20.1 | 19.6 | 19.2 | 19 | 18 | 16.7 | 16.2 | 15 | 14.3 | 13.4 |
| Bonneville | Idaho Falls | µg/m³ | 8.6 | 8.6 | 8.1 | 7.8 | 7.6 | 7.5 | 7.4 | 7.1 | 6.8 | 6.7 | 6.4 | 6.5 | 6.2 | 6.6 | 6.7 | 6.9 | 6.8 | 6.4 | 6.1 | 6 | 5.7 | 5.4 | 5.2 | 4.8 | 4.6 |
| Boundary | Bonners Ferry | µg/m³ | 7.6 | 7.2 | 7.1 | 7.2 | 7.3 | 7.3 | 7.3 | 7.6 | 7.4 | 7.4 | 7.3 | 7.1 | 7 | 7.1 | 6.7 | 6.4 | 6.2 | 6.2 | 5.9 | 6.1 | 6 | 5.8 | 5.5 | 5.1 | 5 |
| Canyon | Nampa | µg/m³ | 14.5 | 14.5 | 14 | 13.7 | 13.4 | 13 | 12.7 | 12.5 | 12 | 11.3 | 10.8 | 10.5 | 10.6 | 10.5 | 10.3 | 9.9 | 9.6 | 9.4 | 9.3 | 8.9 | 8.5 | 8.1 | 7.6 | 7.2 | 6.9 |
| Idaho | Grangeville | µg/m³ | 6.2 | 6.2 | 6 | 5.7 | 5.4 | 5.2 | 4.9 | 4.2 | 4.2 | 4 | 3.3 | 3.3 | 3.1 | 3.3 | 3.4 | 3.5 | 3.6 | 3.2 | 3.1 | 2.9 | 2.4 | 2.4 | 2.3 | 2.3 | 2.2 |
| Kootenai | Coeur d'Alene | µg/m³ | 12.2 | 11 | 11.4 | 11.5 | 11.6 | 12.1 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12 | 11.9 | 11.9 | 12 | 12.1 | 12.2 | 11.7 | 11.3 | 10.7 | 9.8 | 9.2 | 8.6 | 7.8 | 7 |
| Lemhi | Salmon | µg/m³ | 25.1 | 9.4 | 9.8 | 10 | 10.4 | 11.4 | 12.2 | 12.9 | 14.1 | 15.2 | 16 | 16.6 | 17.5 | 18 | 18.3 | 18.7 | 19 | 19.5 | 20 | 21 | 21.9 | 22.7 | 24.1 | 24.7 | 25.1 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 26.4 | 16.7 | 17.2 | 18.1 | 19.4 | 20.2 | 21.2 | 21.7 | 22.8 | 23.3 | 23.4 | 23.4 | 24.3 | 24.9 | 25.2 | 25.6 | 25.7 | 26.1 | 26.2 | 26.4 | 26.2 | 25.6 | 24.5 | 23.7 | 22.9 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 17.4 | 16.9 | 17 | 17 | 17.1 | 17.1 | 17 | 17.1 | 17.4 | 17.3 | 17.2 | 17 | 17 | 16.7 | 16.6 | 15.7 | 14.2 | 12.7 | 11 | 9.5 | 7.8 | 6.9 | 6.7 | 6.2 | 5.7 |
| Nez Perce | Lewiston | µg/m³ | 30.1 | 29.6 | 29.5 | 30 | 30.1 | 29.9 | 29.7 | 29.5 | 28.9 | 27.8 | 23.8 | 20.8 | 18.5 | 17.2 | 16.2 | 15.3 | 14.5 | 14 | 13.5 | 12.6 | 11.6 | 10.2 | 8.6 | 7.5 | 6.4 |
| Shoshone | Pinehurst | µg/m³ | 47.7 | 41.1 | 42.4 | 42.8 | 43.4 | 44.7 | 45 | 45.5 | 45.1 | 45.3 | 45.5 | 45.8 | 46.2 | 46.5 | 47 | 47.2 | 47.5 | 47.6 | 47.7 | 46.9 | 45.3 | 44.1 | 41 | 36.8 | 32.2 |
| Twin Falls | Twin Falls | µg/m³ | 8.9 | 8.7 | 8.7 | 8.9 | 8.8 | 8.8 | 8.7 | 8.5 | 8.2 | 7.8 | 7.6 | 7.5 | 7.5 | 7.7 | 8 | 8 | 8.2 | 8.3 | 8.4 | 8.2 | 8.1 | 8.1 | 8.4 | 8.3 | 8.4 |
