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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 | 16.1 | 16.1 | 15.8 | 15.5 | 15 | 14.3 | 13.8 | 13.2 | 12.9 | 12.6 | 12.5 | 12.4 | 12.3 | 12 | 12 | 11.7 | 11.3 | 10.7 | 10.8 | 10.9 | 11.1 | 11.2 | 11.1 | 11 | 11 |
| Bannock | Pocatello | µg/m³ | 33.2 | 25.9 | 26.9 | 27.6 | 28.2 | 29 | 30 | 31.4 | 32.3 | 33.2 | 33 | 32.9 | 33 | 32.4 | 30.8 | 28.8 | 27 | 26.1 | 25.5 | 24.8 | 24.3 | 23.3 | 22.6 | 21.8 | 21 |
| Benewah | St Maries PM2.5 | µg/m³ | 15.6 | 12.4 | 12.6 | 12.7 | 12.8 | 13 | 13.2 | 13.4 | 13.8 | 14 | 14 | 14.2 | 14.5 | 15.3 | 15.1 | 15.1 | 15.1 | 15.1 | 15.1 | 15.5 | 15.4 | 15.6 | 15.5 | 15.6 | 15.4 |
| Blaine | Ketchum | µg/m³ | 20.3 | 18.6 | 19.3 | 19.6 | 19.8 | 19.8 | 19.9 | 20.1 | 20.3 | 20.3 | 20.3 | 20.2 | 19.9 | 20.2 | 20 | 20 | 19.4 | 18.5 | 17.9 | 17.3 | 16.5 | 15.9 | 15.4 | 14.7 | 14.3 |
| Boise | Idaho City | µg/m³ | 17.6 | 17.6 | 16.9 | 16.3 | 16 | 15.6 | 15.4 | 16 | 15.7 | 15.5 | 15.4 | 15.2 | 15 | 14.7 | 14.2 | 14 | 14 | 14.2 | 14.5 | 14.6 | 14.5 | 13.8 | 13.3 | 13.1 | 12.8 |
| Bonner | Sandpoint | µg/m³ | 11.4 | 11 | 10.8 | 10.7 | 10.7 | 10.4 | 10.4 | 10.5 | 10.5 | 10.7 | 10.8 | 10.7 | 10.8 | 10.7 | 10.7 | 10.7 | 10.7 | 10.7 | 11 | 11 | 11.1 | 11.2 | 11.3 | 11.4 | 11.3 |
| Bonneville | Idaho Falls | µg/m³ | 22.8 | 18.3 | 18.9 | 19.2 | 19.8 | 20.2 | 20.6 | 21.1 | 21.5 | 22.1 | 22.4 | 22.7 | 22.8 | 22.8 | 22.5 | 22.6 | 22.7 | 21.9 | 21 | 20.4 | 19.8 | 19.2 | 18.6 | 18.2 | 18 |
| Boundary | Bonners Ferry | µg/m³ | 6.5 | 4.9 | 4.9 | 4.7 | 4.9 | 4.8 | 4.7 | 4.6 | 4.8 | 4.6 | 4.5 | 4.5 | 4.6 | 5 | 4.7 | 4.8 | 5.1 | 5.4 | 5.6 | 5.5 | 5.3 | 5.9 | 6.2 | 6.4 | 6.5 |
| Boundary | Mt Hall | µg/m³ | 4.9 | 3.7 | 3.7 | 3.9 | 3.9 | 3.8 | 3.7 | 3.9 | 4 | 4 | 4.1 | 4.2 | 4.2 | 4.2 | 4.2 | 4.3 | 4.5 | 4.6 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.8 | 4.9 |
| Boundary | Porthill | µg/m³ | 5 | 4.5 | 4.5 | 4.1 | 4.4 | 4.4 | 4.5 | 4.5 | 4.6 | 4.6 | 4.7 | 4.7 | 4.5 | 4.7 | 4.8 | 4.7 | 4.9 | 4.9 | 5 | 4.6 | 4.6 | 4.6 | 4.7 | 4.9 | 4.9 |
| Canyon | Nampa | µg/m³ | 17.7 | 17.7 | 17.4 | 16.7 | 16.5 | 15.9 | 15.3 | 15 | 14.7 | 14.6 | 14.5 | 14.1 | 13.9 | 13.5 | 13.2 | 12.6 | 12.1 | 11.9 | 11.6 | 11.6 | 11.7 | 12.1 | 12.2 | 12.1 | 12.1 |
| Idaho | Cottonwood | µg/m³ | 82.1 | 82.1 | 78.2 | 74.9 | 72.6 | 64.2 | 55.7 | 51 | 48.4 | 45.4 | 44.7 | 42.5 | 40.6 | 37.8 | 34.7 | 31.9 | 29.2 | 28.1 | 26.2 | 24.2 | 23.2 | 22.8 | 22.4 | 22.1 | 21.7 |
| Idaho | Grangeville | µg/m³ | 59.4 | 59.4 | 58.4 | 57.4 | 56.3 | 55.2 | 54.1 | 52.8 | 52.4 | 52.2 | 52.2 | 51 | 47.3 | 41.2 | 39.4 | 37.8 | 35.9 | 34.8 | 32.5 | 30.4 | 27.8 | 25.6 | 24.4 | 23.9 | 23.8 |
| Kootenai | Coeur d'Alene | µg/m³ | 11.8 | 10.9 | 11 | 10.9 | 11 | 10.9 | 10.7 | 10.8 | 11 | 11.3 | 11.5 | 11.8 | 11.7 | 11.5 | 11.4 | 11.2 | 11.2 | 11 | 11.1 | 11.2 | 11.3 | 11.5 | 11.5 | 11.4 | 11.5 |
| Latah | Juliaetta | µg/m³ | 67.4 | 66.6 | 66.6 | 66.8 | 66.9 | 66.8 | 66.9 | 67.1 | 67.4 | 67.2 | 66.4 | 62.5 | 54 | 44.5 | 38.5 | 34 | 29.2 | 25.3 | 24 | 24.4 | 24.9 | 24.9 | 24.9 | 25.2 | 25.2 |
| Lemhi | Salmon | µg/m³ | 21.6 | 21.6 | 21.3 | 21.4 | 21.2 | 21.2 | 21 | 20.9 | 20.8 | 20.7 | 20.8 | 20.7 | 20.7 | 20.7 | 20.5 | 20.4 | 20 | 19.4 | 18.5 | 17.6 | 17.1 | 16.5 | 16.2 | 15.8 | 15.3 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 139.3 | 112.1 | 111.4 | 110.4 | 109.4 | 108.2 | 107.2 | 106.3 | 105.5 | 105.1 | 105 | 105.4 | 106.3 | 106.6 | 107.2 | 108.7 | 112.8 | 119.1 | 123.6 | 125.7 | 128 | 132.4 | 134.9 | 137 | 139.3 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 69 | 69 | 67.7 | 66.6 | 65.2 | 63.8 | 62.3 | 61.2 | 60.3 | 58.7 | 56 | 49.7 | 43.5 | 37.2 | 31.9 | 28.1 | 26.4 | 25.5 | 24.5 | 24 | 23.3 | 22.6 | 22 | 21.4 | 20.8 |
| Nez Perce | Lewiston | µg/m³ | 48.6 | 48.6 | 46.4 | 44.5 | 43.5 | 42.6 | 41.5 | 40.7 | 40.3 | 39.9 | 39.2 | 38.2 | 37.4 | 33.4 | 30.6 | 29.5 | 29.4 | 29 | 28.9 | 28.9 | 28.5 | 28.3 | 28 | 27.8 | 27.5 |
| Shoshone | Pinehurst | µg/m³ | 9.7 | 9.4 | 9.1 | 9 | 8.9 | 9 | 8.7 | 8.7 | 8.6 | 8.5 | 8.4 | 8.4 | 8.5 | 8.4 | 8.5 | 8.7 | 8.8 | 8.8 | 9 | 9.1 | 9.2 | 9.4 | 9.6 | 9.6 | 9.7 |
| Twin Falls | Twin Falls | µg/m³ | 17.1 | 16.4 | 16.6 | 16.9 | 17.1 | 17.1 | 17.1 | 17.1 | 17 | 16.7 | 16.5 | 16.1 | 15.5 | 15.2 | 14.6 | 13.9 | 13.4 | 13.1 | 13 | 12.8 | 12.5 | 12.5 | 12.5 | 12.6 | 12.6 |
| Valley | McCall | µg/m³ | 22.3 | 22.3 | 21.6 | 20.9 | 20.2 | 19.6 | 19.3 | 18.9 | 18.5 | 18.2 | 18.1 | 17.8 | 17 | 16.2 | 15.5 | 15.2 | 14.9 | 15 | 15 | 15.1 | 15.4 | 15.4 | 15.4 | 15.3 | 15.2 |
| Washington | Weiser | µg/m³ | 16.9 | 16.9 | 16.5 | 16.2 | 15.8 | 15.5 | 15.1 | 14.7 | 14.4 | 14 | 13.6 | 13.2 | 12.9 | 12.5 | 12.3 | 12.1 | 11.9 | 11.7 | 11.5 | 11.4 | 11.4 | 11.3 | 11.3 | 11.3 | 11.4 |
