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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 | 13.8 | 12 | 12.4 | 12.7 | 12.8 | 12.9 | 13.4 | 13.6 | 13.6 | 13.7 | 13.8 | 13.7 | 13.7 | 13.5 | 13.4 | 13.3 | 13.3 | 13.3 | 13.4 | 13.6 | 13.5 | 13.4 | 13 | 12.4 | 12 |
| Bannock | Pocatello | µg/m³ | 8.6 | 4.9 | 5 | 5.3 | 5.5 | 5.5 | 5.5 | 5.5 | 5.7 | 5.9 | 6 | 6.2 | 6.4 | 6.7 | 6.8 | 6.9 | 7.1 | 7.5 | 7.9 | 8.2 | 8.4 | 8.5 | 8.6 | 8.5 | 8.4 |
| Benewah | St Maries PM2.5 | µg/m³ | 30.6 | 22.6 | 24.1 | 24.7 | 25.4 | 25.8 | 26.3 | 26.6 | 27.2 | 27.3 | 27.3 | 27.2 | 27 | 26.8 | 26.7 | 27.6 | 28.5 | 30.6 | 30.1 | 28.9 | 27.9 | 27.6 | 28.1 | 27.7 | 27.1 |
| Blaine | Ketchum | µg/m³ | 0.9 | 0 | 0 | 0 | 0 | 0.2 | 0.2 | 0.2 | 0.4 | 0.5 | 0.5 | 0.6 | 0.7 | 0.9 | 0.9 | 0.9 | 0.7 | 0.7 | 0.7 | 0.7 | 0.8 | 0.8 | 0.9 | 0.8 | 0.7 |
| Boise | Idaho City | µg/m³ | 12.5 | 10.3 | 10.1 | 10 | 9.9 | 10.1 | 10.5 | 10.2 | 10.2 | 10.2 | 10.3 | 10.4 | 10.5 | 10.5 | 10.6 | 10.5 | 10.7 | 10.7 | 11 | 10.9 | 11.7 | 12.1 | 11.9 | 12.2 | 12.5 |
| Bonner | Sandpoint | µg/m³ | 18.4 | 18 | 18.1 | 18 | 18.2 | 18 | 17.9 | 18 | 17.9 | 17.8 | 18 | 17.9 | 17.9 | 18 | 18 | 18.1 | 18.1 | 18.4 | 18.3 | 18.3 | 18.4 | 18.2 | 18.1 | 18.3 | 18.3 |
| Bonneville | Idaho Falls | µg/m³ | 5.8 | 4.3 | 4.4 | 4.3 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.7 | 4.4 | 4.4 | 4.3 | 4.4 | 4.3 | 4.3 | 4.3 | 4.4 | 4.7 | 4.8 | 5 | 5.4 | 5.7 | 5.8 |
| Boundary | Bonners Ferry | µg/m³ | 8.2 | 5.5 | 5.9 | 6 | 6 | 6.1 | 6.3 | 6.6 | 6.8 | 6.9 | 7.1 | 7.4 | 7.8 | 8.2 | 8 | 8.1 | 8.1 | 8 | 8.2 | 8.2 | 8.2 | 8 | 7.8 | 7.8 | 7.8 |
| Canyon | Nampa | µg/m³ | 20.9 | 10.5 | 11.1 | 11.7 | 12.3 | 12.8 | 13.4 | 13.9 | 14.5 | 15.3 | 15.4 | 16 | 16.6 | 17.2 | 17.5 | 17.6 | 18 | 18.4 | 19.1 | 19.7 | 20 | 20.2 | 20.7 | 20.7 | 20.9 |
| Franklin | Preston | µg/m³ | 5.2 | 3.5 | 3.5 | 3.7 | 3.8 | 3.7 | 3.8 | 4 | 4.1 | 4.1 | 4.1 | 4.1 | 4 | 4.2 | 4.2 | 4.3 | 4.3 | 4.3 | 4.4 | 4.5 | 4.6 | 4.9 | 5 | 5.2 | 5.2 |
| Kootenai | Coeur d'Alene | µg/m³ | 23.3 | 22.6 | 22.5 | 22.4 | 22.7 | 22.6 | 22.6 | 22.7 | 22.7 | 22.9 | 23 | 23.3 | 23.2 | 14.9 | 14.8 | 14.8 | 14.7 | 14.5 | 14.2 | 14 | 13.9 | 13.7 | 13.6 | 13.5 | 13.2 |
| Lemhi | Salmon | µg/m³ | 12.5 | 11.1 | 10.2 | 10.1 | 9.9 | 10.4 | 10.9 | 11.9 | 12.5 | 12.2 | 11.7 | 11.7 | 11.7 | 11.8 | 11.8 | 11.9 | 12 | 12 | 12.3 | 12.4 | 12 | 11.5 | 10.4 | 10.3 | 10.2 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 16.3 | 12.2 | 13 | 13.1 | 13.7 | 13.7 | 13.7 | 14.2 | 14.5 | 15.4 | 15.6 | 15.7 | 16 | 16 | 16.1 | 16 | 16 | 15.5 | 15.5 | 15.7 | 15.2 | 15.8 | 16.3 | 15.8 | 15.3 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 25.9 | 21.3 | 22.6 | 23.4 | 24.2 | 24.6 | 25 | 25.1 | 25.2 | 25.3 | 25.7 | 25.8 | 25.9 | 25.6 | 24.7 | 23.1 | 21.5 | 20 | 18.4 | 17.6 | 16.5 | 15.5 | 14.4 | 13.1 | 12.1 |
| Nez Perce | Lewiston | µg/m³ | 34.6 | 28 | 28.7 | 29.5 | 30.1 | 30.7 | 31.3 | 31.6 | 31.8 | 32 | 31.7 | 31.6 | 32.9 | 34.6 | 34.5 | 33.5 | 32.5 | 31.6 | 30.7 | 29.8 | 28.8 | 27.7 | 26.6 | 25.8 | 25 |
| Shoshone | Pinehurst | µg/m³ | 22.3 | 17.3 | 18.4 | 19.3 | 19.8 | 19.8 | 19.9 | 20.5 | 21.2 | 21.7 | 22.1 | 22.3 | 22.2 | 22.1 | 22.2 | 22.2 | 22.2 | 22.1 | 21.5 | 21.5 | 21.7 | 21.9 | 21.7 | 21.7 | 21.9 |
| Twin Falls | Twin Falls | µg/m³ | 10.1 | 6.7 | 7 | 7.2 | 7.5 | 7.6 | 7.6 | 7.7 | 7.9 | 8.2 | 8.6 | 8.9 | 9.1 | 9.2 | 9.5 | 9.9 | 10 | 10.1 | 10.1 | 9.8 | 9.6 | 9.7 | 9.7 | 9.7 | 9.6 |
| Valley | McCall | µg/m³ | 13.6 | 10.5 | 10.6 | 10.5 | 10.4 | 10.4 | 10.5 | 10.6 | 10.6 | 10.5 | 10.4 | 10.5 | 10.4 | 10.6 | 10.6 | 10.6 | 10.2 | 10.5 | 10.5 | 10.6 | 11.2 | 11.4 | 11.9 | 12.9 | 13.6 |
