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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 | 35.5 | 33.3 | 32.8 | 32.7 | 32.4 | 32.1 | 31.9 | 31.6 | 31.7 | 31.6 | 31.7 | 31.6 | 31.7 | 31.9 | 32 | 32.2 | 32.3 | 32.5 | 32.8 | 32.9 | 33.3 | 33.6 | 34 | 34.7 | 35.5 |
| Bannock | Pocatello | µg/m³ | 28.1 | 28.1 | 28 | 27.2 | 26.4 | 25.7 | 24.7 | 24 | 23.2 | 22.3 | 21.5 | 20.3 | 19.2 | 18.5 | 18 | 17.5 | 17 | 16.9 | 16.6 | 16.4 | 16 | 15.7 | 15.7 | 15.9 | 16 |
| Benewah | St Maries PM2.5 | µg/m³ | 46.5 | 46.5 | 44.2 | 42.1 | 39.8 | 37.7 | 35.6 | 34.1 | 32.5 | 30.9 | 29.4 | 27.6 | 25.7 | 24.4 | 23.1 | 22.2 | 22 | 22.1 | 21.8 | 21.4 | 21.5 | 21.5 | 21.6 | 21.5 | 21.6 |
| Blaine | Ketchum | µg/m³ | 22 | 22 | 21 | 20.3 | 19.4 | 18.7 | 17.8 | 17.1 | 16.4 | 16.1 | 15.8 | 15.7 | 15.6 | 15.4 | 15 | 14.6 | 14.6 | 14.7 | 14.9 | 15.1 | 15.1 | 15.1 | 15.1 | 15.3 | 15.1 |
| Boise | Garden Valley | µg/m³ | 38 | 34.9 | 34.8 | 34.9 | 35 | 34.9 | 35.1 | 35.1 | 35.1 | 35.3 | 34.9 | 34.9 | 34.7 | 34.3 | 34.3 | 34.5 | 34.9 | 35.4 | 36.1 | 36.7 | 37.1 | 37.5 | 38 | 37.8 | 37.8 |
| Boise | Idaho City | µg/m³ | 36.2 | 32.4 | 32.2 | 32.1 | 32.3 | 32.2 | 32.3 | 32.7 | 32.5 | 32 | 32 | 32 | 31.8 | 31.8 | 32.1 | 32.3 | 32.8 | 33.4 | 34.3 | 35.5 | 36.2 | 35.2 | 34.9 | 35.1 | 35.6 |
| Bonner | Sandpoint | µg/m³ | 120.5 | 120.5 | 117.7 | 115.3 | 112.6 | 109.9 | 107.1 | 104.7 | 102.5 | 99.3 | 96 | 92.3 | 89 | 86.3 | 82.6 | 78.9 | 74.5 | 69.2 | 64.1 | 59.5 | 54.8 | 51.1 | 48.8 | 46.9 | 45.7 |
| Bonneville | Idaho Falls | µg/m³ | 28.9 | 27.9 | 28.6 | 28.9 | 28.9 | 28.6 | 27.8 | 26.9 | 25.8 | 24.8 | 23.8 | 22.7 | 21.7 | 21 | 20.2 | 20 | 19.9 | 19.9 | 20 | 19.8 | 19.8 | 20 | 19.9 | 19.3 | 18.9 |
| Boundary | Bonners Ferry | µg/m³ | 101.5 | 99.7 | 100.4 | 101 | 101.5 | 101.1 | 100.7 | 100.3 | 99.4 | 98.4 | 96.6 | 94.7 | 92.7 | 89.9 | 87.4 | 84.8 | 82.2 | 78.6 | 74.7 | 71.7 | 69.1 | 66.6 | 63.9 | 61.7 | 59.1 |
| Canyon | Nampa | µg/m³ | 35.5 | 35.2 | 35.5 | 35.3 | 35.2 | 35.2 | 34.8 | 34.4 | 34.2 | 34.1 | 34.1 | 33.7 | 33.4 | 33 | 32.9 | 32.8 | 32.6 | 32.6 | 33 | 33.2 | 33.3 | 33.4 | 33.7 | 34.2 | 34.6 |
| Franklin | Preston | µg/m³ | 12.8 | 11.3 | 11.4 | 11.7 | 12.4 | 12.6 | 12.6 | 12.7 | 12.7 | 12.7 | 12.8 | 12.7 | 12.6 | 12.5 | 12.1 | 11.9 | 11.7 | 11.7 | 11.5 | 11.5 | 11.2 | 10.8 | 10.7 | 10.7 | 10.4 |
| Idaho | Grangeville | µg/m³ | 28.1 | 25.5 | 25.7 | 25.6 | 24.9 | 24.4 | 23.7 | 24.1 | 24.1 | 24.2 | 23.3 | 22.4 | 23.1 | 22.4 | 22.5 | 22.8 | 23.2 | 23.3 | 24 | 25.3 | 26.5 | 27.5 | 27.5 | 27.8 | 28.1 |
| Kootenai | Coeur d'Alene | µg/m³ | 71 | 71 | 68.8 | 65.7 | 62.4 | 59.5 | 56.5 | 53.2 | 50.6 | 48.7 | 47.5 | 46.6 | 45.5 | 44.1 | 41.9 | 39.4 | 37.2 | 34.9 | 33 | 31.1 | 29 | 26.6 | 25.4 | 24.2 | 22.9 |
| Latah | Juliaetta | µg/m³ | 26.5 | 26.5 | 26.3 | 25.2 | 24.2 | 22.8 | 21.6 | 20.7 | 19.9 | 19 | 18.2 | 18.1 | 17.9 | 18.4 | 19.1 | 19.5 | 19.8 | 19.5 | 19.7 | 20.2 | 20.4 | 20.6 | 20.7 | 20.9 | 21.2 |
| Latah | Moscow | µg/m³ | 28 | 28 | 26 | 23 | 20 | 17.2 | 15.1 | 14.7 | 14.7 | 14.8 | 14.7 | 15 | 14.9 | 14.9 | 15 | 14.9 | 15 | 15 | 15.2 | 15.5 | 15.3 | 15.4 | 15.5 | 15.6 | 15.4 |
| Lemhi | Salmon | µg/m³ | 38.7 | 38.7 | 37.8 | 37 | 36.5 | 35.9 | 35.3 | 35 | 34.3 | 33.7 | 33.2 | 32.8 | 32.1 | 31.4 | 30.9 | 30.6 | 30.4 | 30.3 | 30.1 | 29.9 | 29.7 | 29.5 | 29.4 | 29.5 | 29.5 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 28 | 22.5 | 22.5 | 22.5 | 22.8 | 23.2 | 23.5 | 23.5 | 23.6 | 23.4 | 23.1 | 22.4 | 21.5 | 21 | 21.5 | 21.7 | 22 | 22.5 | 24 | 25.2 | 26.1 | 26.8 | 27.4 | 27.4 | 28 |
| Madison | Rexburg | µg/m³ | 26.2 | 25 | 25.3 | 25.5 | 25.6 | 25.4 | 26 | 26.2 | 25.9 | 25.9 | 25.3 | 24.5 | 23.4 | 22.5 | 21.8 | 21.1 | 20.9 | 20.5 | 20.3 | 20.3 | 20.5 | 20.7 | 20.4 | 20.1 | 19.6 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 22.1 | 17.4 | 17.1 | 17 | 16.6 | 16.3 | 15.8 | 15.6 | 15.3 | 15.3 | 15.2 | 15.3 | 16.8 | 18.6 | 20.3 | 21.3 | 21.7 | 21.5 | 21.9 | 21.8 | 21.7 | 21.9 | 22 | 22 | 22.1 |
| Nez Perce | Lewiston | µg/m³ | 22.7 | 22.7 | 22.6 | 22.1 | 21.9 | 21.9 | 21.5 | 21 | 20.5 | 21 | 20.7 | 20.2 | 19.7 | 18.2 | 17.7 | 17.7 | 17.6 | 17.7 | 17.7 | 17.4 | 17.2 | 17.8 | 18.3 | 19 | 19.5 |
| Shoshone | Pinehurst | µg/m³ | 58.7 | 58.7 | 56.2 | 53.5 | 51 | 48.5 | 46.1 | 43.8 | 41.5 | 39.2 | 36.3 | 34.2 | 32.8 | 29.7 | 27.5 | 26.3 | 25 | 23.9 | 23.6 | 23.3 | 23.1 | 22.8 | 22.7 | 22.5 | 22.2 |
| Twin Falls | Twin Falls | µg/m³ | 40.5 | 40.5 | 38.4 | 36.8 | 35.3 | 33.6 | 32 | 31 | 30 | 29 | 28.2 | 27.7 | 27.1 | 26.5 | 26 | 25.6 | 25.5 | 25.5 | 25.3 | 25.6 | 25.9 | 25.7 | 25.5 | 26.3 | 27.1 |
| Valley | McCall | µg/m³ | 33.1 | 31.7 | 30.7 | 29.5 | 28.5 | 27.7 | 26.7 | 26 | 25.4 | 25 | 24.5 | 23.9 | 23.3 | 23.2 | 23.1 | 23.3 | 23.7 | 24.8 | 25.9 | 27 | 28.4 | 29.6 | 30.8 | 31.8 | 33.1 |
