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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 | 18.7 | 17.5 | 17.8 | 17.8 | 18.1 | 18.2 | 18.5 | 18.7 | 18.7 | 18.5 | 18 | 17.6 | 17.2 | 17.5 | 17.5 | 17.5 | 17.6 | 17.9 | 17.7 | 17.5 | 17 | 16.8 | 16.7 | 16.5 | 16.3 |
| Bannock | Pocatello | µg/m³ | 25 | 6 | 5.9 | 6.2 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.7 | 7.4 | 7.8 | 8.2 | 9 | 11 | 13.6 | 16.2 | 17.6 | 18.6 | 19.7 | 21 | 22.1 | 23 | 23.8 | 25 |
| Benewah | St Maries PM2.5 | µg/m³ | 14.8 | 14.8 | 14.2 | 13.6 | 13.3 | 12.8 | 12.5 | 12.2 | 11.7 | 11.6 | 11.4 | 11.1 | 11.1 | 10.9 | 11 | 11.2 | 11.1 | 11.1 | 11.3 | 11.4 | 11.7 | 11.7 | 11.8 | 11.9 | 12.4 |
| Blaine | Ketchum | µg/m³ | 18.5 | 6.1 | 6.5 | 6.8 | 7.1 | 7.5 | 7.7 | 8 | 8.3 | 8.7 | 9 | 9.7 | 10.2 | 10.5 | 11 | 11.3 | 12.3 | 13.3 | 14 | 15.2 | 16.4 | 17.1 | 17.8 | 18.3 | 18.5 |
| Boise | Idaho City | µg/m³ | 27.8 | 26.7 | 27 | 27.2 | 27.5 | 27.7 | 27.8 | 27.7 | 27.6 | 27.5 | 27.1 | 26.5 | 26 | 25.8 | 25.8 | 26.2 | 26.1 | 25.7 | 25 | 24.5 | 23.5 | 21.7 | 20.2 | 19.2 | 18.4 |
| Bonner | Sandpoint | µg/m³ | 12.1 | 11.6 | 11.8 | 11.7 | 11.7 | 11.7 | 12 | 12 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12 | 12 | 12 | 12 | 11.9 | 11.5 | 11.6 | 11.4 | 11.5 | 11.3 | 11.2 | 11.1 |
| Bonneville | Idaho Falls | µg/m³ | 17.5 | 7.4 | 7.5 | 7.9 | 8.1 | 8.3 | 8.6 | 8.7 | 8.7 | 8.6 | 8.7 | 8.8 | 8.9 | 9.1 | 9.7 | 9.9 | 10.2 | 11.1 | 12.3 | 13.4 | 14.5 | 15.4 | 16.2 | 16.9 | 17.5 |
| Boundary | Bonners Ferry | µg/m³ | 5.6 | 5.6 | 5.4 | 5.3 | 5.2 | 5.4 | 5.2 | 5.2 | 5.1 | 5.4 | 5.2 | 5.4 | 5.3 | 5.1 | 5.3 | 5.2 | 5.1 | 5.1 | 4.9 | 4.9 | 5 | 5 | 4.9 | 4.9 | 4.9 |
| Boundary | Mt Hall | µg/m³ | 3.9 | 3.8 | 3.9 | 3.7 | 3.5 | 3.4 | 3.6 | 3.4 | 3.5 | 3.6 | 3.6 | 3.6 | 3.6 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.5 | 3.6 | 3.6 | 3.6 | 3.7 | 3.7 |
| Boundary | Porthill | µg/m³ | 4.4 | 3.9 | 4.1 | 4 | 4 | 3.9 | 4 | 3.9 | 3.7 | 3.9 | 3.9 | 4 | 4.2 | 4.2 | 4.1 | 4.1 | 4 | 4.1 | 3.8 | 4.1 | 4.2 | 4.3 | 4.4 | 4.2 | 4.4 |
| Canyon | Nampa | µg/m³ | 22.2 | 17.7 | 17.7 | 18.2 | 18.3 | 18.9 | 19.5 | 19.7 | 19.9 | 20.4 | 20.5 | 20.8 | 20.7 | 20.9 | 21.1 | 21.3 | 21.5 | 21.9 | 22.2 | 21.7 | 20.9 | 20.1 | 19.6 | 18.8 | 18.1 |
| Idaho | Cottonwood | µg/m³ | 100 | 66.1 | 69.3 | 72.1 | 73.9 | 82 | 89.9 | 93.8 | 96 | 98.1 | 97.2 | 97.9 | 97.6 | 99.3 | 100 | 99.4 | 98.8 | 96.1 | 94.8 | 94.2 | 93.3 | 92.2 | 90.8 | 88.3 | 85.3 |
| Idaho | Grangeville | µg/m³ | 65.7 | 62.9 | 63.8 | 64.5 | 65 | 64.9 | 64.8 | 64.9 | 64.8 | 63.6 | 62.4 | 61.4 | 62.2 | 65.3 | 65.7 | 65.2 | 64.7 | 63.7 | 63.5 | 62.7 | 62.6 | 62.3 | 61.1 | 60.8 | 60.2 |
| Kootenai | Coeur d'Alene | µg/m³ | 12 | 12 | 11.7 | 11.6 | 11.2 | 11 | 10.9 | 10.8 | 10.8 | 11 | 10.9 | 10.7 | 10.7 | 10.6 | 10.7 | 10.7 | 10.8 | 11.2 | 11.3 | 11.2 | 11.4 | 11.2 | 11.1 | 11 | 10.8 |
| Latah | Juliaetta | µg/m³ | 67.4 | 34.7 | 34.2 | 33.8 | 33.7 | 33.7 | 33.6 | 33.4 | 33.3 | 33.4 | 33.4 | 36.2 | 43.7 | 52.2 | 56.6 | 59.7 | 63.8 | 67.1 | 67.4 | 66.6 | 66.3 | 66.5 | 66.7 | 66.6 | 66.6 |
| Lemhi | Salmon | µg/m³ | 21.6 | 10.5 | 11.1 | 11.4 | 11.7 | 12 | 12.4 | 12.8 | 13.2 | 13.7 | 14 | 14.7 | 15.2 | 15.7 | 16.3 | 17.1 | 18 | 18.7 | 19.5 | 20.5 | 21.2 | 21.5 | 21.1 | 21.3 | 21.6 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 121.2 | 82.5 | 84.8 | 87.1 | 89.3 | 91.9 | 94.2 | 96.4 | 98.5 | 100.3 | 101.7 | 104.9 | 108.6 | 112.6 | 117.4 | 120 | 121.2 | 120 | 120.2 | 119.1 | 118.7 | 116.5 | 115.1 | 114.6 | 113.5 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 74.7 | 42.8 | 44 | 44.9 | 46 | 47 | 48 | 49 | 50.4 | 53.1 | 56 | 61.5 | 64.8 | 68.2 | 71 | 74 | 74.7 | 74.2 | 73.9 | 73.2 | 72.5 | 71.7 | 71.2 | 70.6 | 69.7 |
| Nez Perce | Lewiston | µg/m³ | 67.9 | 54.2 | 56.1 | 57.9 | 59.4 | 61.2 | 63.4 | 64.6 | 65.2 | 65.8 | 66.7 | 67.5 | 66.8 | 67.9 | 67.1 | 64.7 | 63.2 | 61.8 | 60.2 | 58.7 | 56.9 | 54.7 | 53.1 | 51.3 | 49.9 |
| Shoshone | Pinehurst | µg/m³ | 11.4 | 11.4 | 11.3 | 11.1 | 10.8 | 10.7 | 10.8 | 10.7 | 10.5 | 10.6 | 10.7 | 10.7 | 10.7 | 10.7 | 10.8 | 10.9 | 10.8 | 10.8 | 10.8 | 11 | 10.6 | 10.2 | 10.3 | 10 | 9.6 |
| Twin Falls | Twin Falls | µg/m³ | 16.2 | 7.7 | 7.7 | 7.7 | 7.7 | 7.8 | 7.7 | 7.8 | 7.8 | 8.2 | 8.5 | 9 | 9.9 | 10.5 | 11.1 | 12 | 12.7 | 13.3 | 13.8 | 14.4 | 15.2 | 15.5 | 15.8 | 16 | 16.2 |
| Valley | McCall | µg/m³ | 36.2 | 36.2 | 35.4 | 34.7 | 33.8 | 32.6 | 31.4 | 30.3 | 28.9 | 28.1 | 26.7 | 25.7 | 25 | 25.4 | 26.2 | 26.4 | 26.3 | 25.7 | 25.4 | 25.2 | 24.6 | 24.2 | 23.9 | 23.5 | 23 |
| Washington | Weiser | µg/m³ | 21 | 20.1 | 20.3 | 20.5 | 20.5 | 20.6 | 20.7 | 20.6 | 20.6 | 20.6 | 20.8 | 21 | 20.7 | 20.3 | 20.2 | 20 | 19.9 | 19.7 | 19.5 | 19.1 | 18.7 | 18.3 | 17.9 | 17.6 | 17.2 |
