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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 | 89.3 | 89.3 | 87.8 | 86.3 | 84.2 | 82 | 80.1 | 77.6 | 75.6 | 69.8 | 63.1 | 60.6 | 57.1 | 55.3 | 54.3 | 53.1 | 52.3 | 51.8 | 52.5 | 53.1 | 54 | 54.8 | 56 | 57.2 | 58.1 |
| Bannock | Pocatello | µg/m³ | 56.7 | 56.7 | 55.6 | 55 | 53.9 | 52.7 | 51.1 | 49.6 | 48 | 44.6 | 41.2 | 37.8 | 34.5 | 30.8 | 27.2 | 23.7 | 20.5 | 18.9 | 18 | 17.2 | 16.7 | 16.6 | 16.3 | 15.7 | 15.2 |
| Benewah | St Maries PM2.5 | µg/m³ | 25.5 | 25.5 | 25.3 | 25 | 24.7 | 24.7 | 24.3 | 24.2 | 24.2 | 24.1 | 24.2 | 24.3 | 23.9 | 23.9 | 23.8 | 23.8 | 24.1 | 24.2 | 24.3 | 24.5 | 24.6 | 24.8 | 24.6 | 24.5 | 24.8 |
| Blaine | Ketchum | µg/m³ | 46.1 | 41.4 | 42.5 | 43.5 | 44.6 | 45.5 | 45.9 | 46.1 | 45.9 | 46 | 46 | 45.5 | 45.3 | 44.9 | 44.5 | 43.5 | 41.5 | 40.7 | 39.6 | 39.1 | 37.9 | 35.7 | 33.9 | 32.7 | 31.6 |
| Boise | Garden Valley | µg/m³ | 63.9 | 63.9 | 62.3 | 60.5 | 59 | 57.3 | 56 | 54.3 | 52.6 | 50.9 | 49.4 | 48.2 | 47.2 | 46.2 | 44.7 | 43.3 | 42.9 | 43.1 | 43.2 | 43.6 | 43.9 | 44.4 | 44.6 | 45 | 45.7 |
| Boise | Idaho City | µg/m³ | 60 | 60 | 59.2 | 58.7 | 57.7 | 57 | 56.1 | 55.2 | 53.7 | 52.5 | 51.1 | 50 | 48.4 | 47.5 | 47 | 46.8 | 46.2 | 45.8 | 44.8 | 43.7 | 42.8 | 41.9 | 41.3 | 41 | 40.9 |
| Bonner | Sandpoint | µg/m³ | 18.2 | 14.3 | 14.5 | 14.7 | 15 | 15.2 | 15.3 | 15.2 | 14.9 | 15 | 15.1 | 15.3 | 15.8 | 16.1 | 16.1 | 17.1 | 17.5 | 17.8 | 18.1 | 18.2 | 18.2 | 18 | 18.1 | 18 | 18 |
| Bonneville | Idaho Falls | µg/m³ | 68.2 | 68.2 | 67 | 64.9 | 62.6 | 60.5 | 57.7 | 54.2 | 51.1 | 47.3 | 43.7 | 40.1 | 38.3 | 35.2 | 32 | 28.4 | 24.5 | 20.2 | 15.8 | 12.8 | 9.8 | 9.4 | 9.1 | 8.7 | 8.5 |
| Boundary | Bonners Ferry | µg/m³ | 18 | 10.6 | 11 | 11 | 10.9 | 10.7 | 10.7 | 10.6 | 10.6 | 10.6 | 10.5 | 10.8 | 11.4 | 12.1 | 12.5 | 13.6 | 15 | 16.1 | 17.2 | 17.6 | 18 | 18 | 18 | 18 | 18 |
| Boundary | Mt Hall | µg/m³ | 17.8 | 10 | 10.1 | 10 | 10 | 10 | 9.9 | 9.9 | 9.9 | 10 | 10.2 | 10.5 | 11 | 11.7 | 13 | 14.5 | 15.8 | 16.7 | 17.1 | 17.7 | 17.8 | 17.8 | 17.7 | 17.6 | 17.5 |
| Boundary | Porthill | µg/m³ | 34.6 | 16.7 | 19.4 | 21.6 | 23.6 | 25.1 | 26.1 | 27 | 27.1 | 27.3 | 27.5 | 27.5 | 28 | 29.2 | 30.7 | 32.1 | 33.1 | 33.7 | 33.8 | 34.3 | 34.6 | 32 | 31.8 | 32.1 | 31.8 |
| Canyon | Nampa | µg/m³ | 113.8 | 113.8 | 109.2 | 103.5 | 101.3 | 100 | 100.2 | 99.8 | 97.3 | 94.6 | 94.2 | 94.7 | 94.8 | 93.7 | 92.7 | 92 | 90.8 | 91.5 | 92.2 | 93.4 | 95.1 | 97.4 | 98.8 | 100.1 | 101.8 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 28.1 | 28.1 | 27.5 | 26.4 | 25.9 | 24.8 | 24.3 | 23.8 | 23 | 22.4 | 21.6 | 21.3 | 21.4 | 21 | 20.9 | 21.1 | 21 | 21.1 | 21.4 | 21.7 | 22 | 22.6 | 22.9 | 24 | 24.6 |
| Franklin | Preston | µg/m³ | 21 | 16.7 | 17 | 17.3 | 17.6 | 18 | 18.4 | 18.5 | 18.7 | 19.1 | 19.5 | 20.1 | 20.5 | 20.9 | 21 | 20.7 | 19.7 | 18.4 | 18.2 | 17.9 | 17.2 | 16.3 | 15.2 | 14.5 | 14 |
| Idaho | Cottonwood | µg/m³ | 29.5 | 24.5 | 24.6 | 24.8 | 24.9 | 24.8 | 24.8 | 24.8 | 24.9 | 25.5 | 25.6 | 25.5 | 24.7 | 23.9 | 23.5 | 23.4 | 23.6 | 23.6 | 23.8 | 24.1 | 25 | 26.2 | 27.4 | 28.7 | 29.5 |
| Idaho | Grangeville | µg/m³ | 32.1 | 32.1 | 31.6 | 30.8 | 30.1 | 29.7 | 29.3 | 29 | 28.3 | 28 | 27.5 | 27.1 | 26.6 | 25.8 | 25.2 | 24.4 | 23.7 | 23.5 | 23.6 | 24.1 | 24.2 | 24.7 | 25.4 | 26.3 | 27.4 |
| Kootenai | Coeur d'Alene | µg/m³ | 22.8 | 22.8 | 22 | 21.3 | 20.7 | 20.4 | 20.2 | 20.2 | 20.2 | 20.5 | 20.8 | 21.2 | 21.4 | 21.1 | 20.3 | 20.2 | 20 | 20.3 | 20.6 | 20.6 | 20.2 | 20 | 19.5 | 19.3 | 19.1 |
| Latah | Juliaetta | µg/m³ | 32.4 | 32.3 | 31.5 | 31.8 | 31.2 | 30.3 | 29.9 | 29.3 | 28.7 | 28.3 | 28 | 27.9 | 27.9 | 27.8 | 28.3 | 28.5 | 28.6 | 28.9 | 29.6 | 30 | 30.6 | 31.1 | 31.7 | 32 | 32.4 |
| Latah | Troy | µg/m³ | 28.2 | 26.4 | 25.5 | 25.1 | 25.3 | 25.6 | 25.5 | 26.2 | 25.9 | 25.6 | 25.4 | 25 | 24.8 | 24.7 | 24.7 | 24.7 | 25.1 | 25.3 | 25.6 | 26.1 | 26.5 | 27.2 | 27.5 | 27.8 | 28.2 |
| Lemhi | Salmon | µg/m³ | 41 | 37.4 | 37.6 | 37.7 | 38.2 | 38.4 | 38.7 | 39.2 | 39.7 | 40.2 | 40.2 | 40.1 | 40.1 | 40.1 | 40.1 | 40.4 | 40.9 | 40.9 | 41 | 40.2 | 40.1 | 40.1 | 39.5 | 38.8 | 38.2 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 30.5 | 25.3 | 25.5 | 25.2 | 25.5 | 25.3 | 25 | 24.9 | 24.8 | 24.5 | 24.1 | 24.3 | 24.8 | 24.5 | 24.8 | 25.1 | 25.6 | 26.5 | 27.6 | 28.5 | 29.5 | 30.5 | |||
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 35.2 | 35.2 | 34.2 | 33.4 | 32.5 | 31.9 | 31 | 30 | 29.3 | 28.7 | 28.5 | 27.9 | 27.5 | 27 | 26.9 | 26.4 | 26.2 | 26.1 | 26.2 | 26.5 | 27 | 27.3 | 27.7 | 28.4 | 28.7 |
| Madison | Rexburg | µg/m³ | 25.9 | 25.9 | 25.8 | 25.8 | 25.3 | 24.8 | 24.4 | 23.9 | 23.8 | 23.5 | 23.4 | 23.4 | 23.5 | 23.5 | 23.6 | 23.7 | 22 | 19.2 | 16 | 12.5 | 9.6 | 8.7 | 8.5 | 8.5 | 8.1 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 34 | 33.3 | 32.5 | 31.5 | 30.6 | 29.8 | 29 | 28.8 | 28.1 | 27.5 | 27.2 | 27.1 | 27.4 | 27.5 | 27.3 | 27.1 | 26.8 | 27.2 | 28.2 | 29 | 29.5 | 30.8 | 31.8 | 32.9 | 34 |
| Nez Perce | Lewiston | µg/m³ | 38.1 | 35.8 | 34.7 | 33.9 | 33.1 | 32.7 | 31.9 | 31.3 | 30.2 | 29.4 | 29.3 | 29.2 | 29 | 29 | 29.3 | 29.3 | 29.4 | 30.2 | 31.3 | 33 | 34.1 | 35.5 | 36.5 | 37.2 | 38.1 |
| Shoshone | Pinehurst | µg/m³ | 25.2 | 24.1 | 24.5 | 24.5 | 24.8 | 24.9 | 25.2 | 25.1 | 25.2 | 25.1 | 25 | 24.6 | 24 | 23.9 | 24 | 24 | 24 | 24.2 | 24.2 | 24.3 | 24.2 | 24.1 | 24.4 | 24.4 | 24.4 |
| Twin Falls | Twin Falls | µg/m³ | 119.5 | 119.5 | 118.8 | 118.1 | 117.4 | 116.3 | 114.9 | 112.7 | 108.4 | 101.8 | 96.8 | 93.6 | 91.1 | 88.6 | 86.1 | 83.3 | 80.6 | 77 | 73 | 68.8 | 64.8 | 60.7 | 56.5 | 52.8 | 49.2 |
| Valley | McCall | µg/m³ | 41.9 | 38 | 37.4 | 36.8 | 36.3 | 35.9 | 35.3 | 34.8 | 34.5 | 34.1 | 33.6 | 33.1 | 32.4 | 32.3 | 33.1 | 33.8 | 35.1 | 35.9 | 36.6 | 38.9 | 41 | 41.8 | 41.9 | 41.4 | 41.2 |
