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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ada | Boise White Pine | µg/m³ | 13 | 10.9 | 11 | 11 | 11.2 | 11.1 | 11 | 11.1 | 11.3 | 11.3 | 11.7 | 12.3 | 12.7 | 12.8 | 13 | 12.9 | 12.6 | 12.5 | 12.3 | 12.2 | 11.8 | 11.4 | 10.9 | 10.3 | 10 |
| Bannock | Pocatello | µg/m³ | 5 | 5 | 4.9 | 4.7 | 4.5 | 4.7 | 4.9 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.4 | 4.2 | 4 | 3.9 | 3.8 | 3.8 | 3.7 | 3.7 | 3.6 | 3.5 | 3.2 | 3.1 | 3 |
| Benewah | St Maries PM2.5 | µg/m³ | 26.7 | 26.5 | 26.7 | 26.5 | 26.4 | 26.4 | 26.4 | 26.2 | 25.9 | 25.5 | 25.1 | 24.6 | 23.8 | 22.9 | 22.3 | 21.5 | 20.8 | 19.9 | 19.2 | 18.5 | 17.7 | 16.5 | 15.7 | 15 | 14.2 |
| Blaine | Ketchum | µg/m³ | 2.5 | 1 | 0.9 | 0.9 | 1 | 0.9 | 0.8 | 1.1 | 1.2 | 1.2 | 1.5 | 1.5 | 1.5 | 1.5 | 1.3 | 1.3 | 1.4 | 1.4 | 1.4 | 1.5 | 1.7 | 1.9 | 2.1 | 2.1 | 2.5 |
| Boise | Idaho City | µg/m³ | 31 | 19.7 | 19.8 | 20.5 | 21.2 | 22.1 | 23.7 | 25.2 | 27 | 27.5 | 27.5 | 29.5 | 30.9 | 31 | 31 | 30.9 | 30.8 | 30.6 | 30.5 | 30.5 | 30.5 | 30.2 | 29.5 | 29.2 | 28.9 |
| Bonner | Sandpoint | µg/m³ | 46.2 | 37 | 38.2 | 39.2 | 40.1 | 40.8 | 41.7 | 42.5 | 43 | 43.4 | 44.1 | 45 | 45.7 | 46.2 | 46.1 | 45.6 | 45 | 44.9 | 45.3 | 45.7 | 45.6 | 45.2 | 44.7 | 44 | 43.2 |
| Bonneville | Idaho Falls | µg/m³ | 5 | 4.8 | 4.7 | 4.6 | 4.6 | 4.7 | 4.8 | 4.8 | 5 | 4.8 | 4.6 | 4.5 | 4.6 | 4.8 | 4.8 | 4.8 | 4.7 | 4.8 | 4.9 | 4.5 | 4.3 | 4.3 | 3.9 | 3.8 | 3.6 |
| Boundary | Bonners Ferry | µg/m³ | 35 | 22.5 | 23.3 | 24 | 24.9 | 25.3 | 26 | 26.7 | 27.3 | 28.2 | 29.3 | 30.2 | 31.1 | 31.5 | 32.4 | 33 | 33.4 | 33.4 | 33.4 | 33.7 | 33.8 | 34.2 | 34.6 | 34.7 | 35 |
| Boundary | Mt Hall | µg/m³ | 37.9 | 26.8 | 27.7 | 28.5 | 29.5 | 30.7 | 31.5 | 32.6 | 33.5 | 34.5 | 35.1 | 35.3 | 35.5 | 35.9 | 35.9 | 35.7 | 35.7 | 36.4 | 37 | 37.4 | 37.8 | 37.9 | 37.7 | 37.6 | 37.3 |
| Boundary | Porthill | µg/m³ | 34.2 | 23.3 | 24.2 | 25.1 | 25.9 | 26.8 | 27.7 | 28.6 | 29.2 | 29.9 | 30.4 | 31 | 30.6 | 30.6 | 30.7 | 31 | 31.8 | 32.3 | 32.8 | 33.3 | 33.8 | 33.8 | 34 | 34.1 | 34.2 |
| Canyon | Nampa | µg/m³ | 17.8 | 14.3 | 14.9 | 15.5 | 16 | 16.2 | 16.4 | 16.4 | 16.6 | 16.6 | 16.8 | 17.3 | 17.5 | 17.6 | 17.8 | 17.7 | 17.6 | 17.3 | 17.1 | 17.1 | 17 | 17.2 | 16.4 | 15.6 | 14.6 |
| Idaho | Cottonwood | µg/m³ | 19.3 | 19.3 | 18.9 | 18.2 | 17.4 | 16.9 | 16.4 | 16.1 | 15.9 | 15.6 | 15.2 | 14.9 | 14.5 | 14.2 | 14.1 | 13.9 | 13.9 | 13.7 | 12.9 | 12.7 | 12.2 | 11.9 | 11.1 | 10.7 | 10.4 |
| Idaho | Grangeville | µg/m³ | 20.7 | 20.7 | 20.5 | 20.5 | 20.3 | 20 | 19.8 | 19.8 | 19.4 | 19.2 | 18.8 | 18.4 | 18.1 | 17.7 | 17.6 | 17.3 | 17.1 | 17 | 16.7 | 16.4 | 16.3 | 16.4 | 16 | 15.6 | 15.4 |
| Kootenai | Coeur d'Alene | µg/m³ | 54 | 44 | 45.1 | 45.9 | 46.7 | 47.8 | 48.7 | 49.5 | 50.5 | 51.7 | 52.6 | 53.4 | 53.9 | 54 | 53.5 | 52.7 | 51.8 | 50.2 | 48.1 | 45.7 | 43.2 | 41 | 38.7 | 36.9 | 35.1 |
| Latah | Juliaetta | µg/m³ | 23.3 | 23.3 | 22.1 | 21.2 | 20.4 | 19.2 | 18.5 | 18 | 17.3 | 17 | 16.5 | 15.5 | 15.2 | 14.9 | 14.8 | 15.1 | 14.9 | 14.6 | 14.7 | 14.7 | 14.5 | 14.5 | 14.4 | 14 | 14 |
| Lemhi | Salmon | µg/m³ | 11.5 | 11.5 | 11.1 | 10.7 | 10.2 | 9.7 | 9.3 | 8.7 | 8 | 7.5 | 7.1 | 6.7 | 6.3 | 5.6 | 5.2 | 4.8 | 4.2 | 3.9 | 3.4 | 3 | 2.5 | 2.3 | 2.1 | 1.8 | 1.6 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 29.2 | 25.7 | 29.2 | 28 | 27.6 | 27.2 | 26.3 | 25.5 | 25.2 | 24.4 | 23.2 | 22.5 | 22.9 | 22.7 | 22.7 | 23.1 | 23.2 | 23 | 22.8 | 22.4 | 22.2 | 22 | 21.6 | 21.2 | 21.2 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 27.5 | 27.5 | 26.9 | 26.2 | 25.7 | 24.9 | 24.4 | 23.5 | 22.8 | 22.1 | 21.7 | 21.1 | 20.2 | 19.2 | 18.5 | 17.5 | 16.7 | 15.9 | 15.5 | 15 | 14.5 | 14 | 13.4 | 13 | 12.5 |
| Nez Perce | Lewiston | µg/m³ | 28.2 | 28.2 | 27.2 | 26.4 | 25.6 | 25.1 | 24.9 | 24.3 | 23.5 | 22.9 | 22.6 | 22.4 | 22.2 | 21.9 | 21.6 | 21.2 | 20.7 | 20.2 | 19.9 | 19.5 | 18.8 | 18.2 | 17.6 | 17.2 | 16.8 |
| Shoshone | Pinehurst | µg/m³ | 37.7 | 30.9 | 31.7 | 32.7 | 33.7 | 34.4 | 35.2 | 35.7 | 36.3 | 36.7 | 36.9 | 37.3 | 37.7 | 37 | 35.9 | 34.3 | 33.2 | 32 | 30.6 | 29.3 | 27.9 | 26.6 | 25.4 | 24 | 22.5 |
| Twin Falls | Twin Falls | µg/m³ | 21.5 | 18.8 | 19.4 | 20.1 | 20.6 | 21.2 | 21.5 | 21.2 | 20.5 | 20.4 | 20.4 | 20.3 | 20.1 | 19.8 | 19.7 | 19.6 | 19.4 | 19.2 | 19.1 | 18.7 | 17.2 | 15 | 12.7 | 11.4 | 10.2 |
| Valley | McCall | µg/m³ | 29.8 | 26.4 | 27.2 | 27.7 | 28.1 | 28.4 | 28.5 | 28.5 | 28.6 | 28.8 | 29.1 | 29.4 | 29.5 | 29.8 | 28.5 | 26.9 | 24.9 | 22.9 | 21.4 | 20 | 19.1 | 17.7 | 16.3 | 14.9 | 13.8 |
| Washington | Weiser | µg/m³ | 13.7 | 13.7 | 13.6 | 13.5 | 13.4 | 13.4 | 13.3 | 13.3 | 13.2 | 13.3 | 13.4 | 13.4 | 13.5 | 13.6 | 13.5 | 13.4 | 13.3 | 13.2 | 13 | 12.9 | 12.8 | 12.5 | 12.3 | 12.2 | 12.1 |
