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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bannock | Pocatello | µg/m³ | 19.1 | 17.3 | 17.2 | 17.2 | 17.6 | 17.7 | 17.6 | 17.7 | 17.8 | 18.4 | 18.7 | 19.1 | 19 | 19 | 18.8 | 18.5 | 18.4 | 17.9 | 17.6 | 17.7 | 17.6 | 17.7 | 17.6 | 17.6 | 17.6 |
| Boise | Idaho City | µg/m³ | 28.9 | 20.3 | 21.3 | 22.1 | 23.6 | 24.6 | 25.7 | 26.8 | 27.9 | 28.4 | 28.9 | 28.9 | 28.7 | 28.7 | 28.7 | 28.6 | 28.5 | 28.3 | 28.3 | 27.7 | 25.6 | 24.7 | 24.8 | 23.9 | 23 |
| Bonner | Sandpoint | µg/m³ | 22.3 | 22.1 | 22.3 | 22.2 | 22.2 | 22.2 | 22.1 | 22 | 21.9 | 22 | 21.8 | 21.4 | 21.3 | 20.9 | 20.8 | 20.3 | 20 | 19.8 | 19.6 | 19 | 18.2 | 17.8 | 17 | 16.5 | 16.2 |
| Canyon | Nampa | µg/m³ | 22.2 | 18.3 | 18.8 | 19.5 | 20 | 20.5 | 20.9 | 21.6 | 22.2 | 22.2 | 21.7 | 20.8 | 20.1 | 19.4 | 18.8 | 18.6 | 19 | 19.1 | 18.8 | 18.7 | 18.7 | 18.4 | 18.4 | 18 | 17.8 |
| Kootenai | Coeur d'Alene | µg/m³ | 21.5 | 19.9 | 20.2 | 20.5 | 20.7 | 20.9 | 21.2 | 21.3 | 21.5 | 21.5 | 21.4 | 21.2 | 21.1 | 20.9 | 20.5 | 20.2 | 20.1 | 20.1 | 20.2 | 20 | 19.9 | 19.3 | 19 | 18.5 | 18 |
| Lemhi | Salmon | µg/m³ | 41.7 | 41.7 | 40.5 | 39.1 | 37.8 | 36.6 | 35.5 | 34.4 | 33.1 | 31.7 | 30.3 | 29.1 | 27.6 | 26.2 | 25.2 | 24.5 | 23.8 | 23.1 | 22.5 | 21.9 | 21.5 | 20.9 | 20.2 | 19.7 | 19.1 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 28.7 | 28.7 | 28.3 | 28.5 | 28.2 | 28 | 27.7 | 27.4 | 27.3 | 27.1 | 26.7 | 26.6 | 26.5 | 26.7 | 25.6 | 24.7 | 24 | 23.4 | 22.7 | 22 | 21.1 | 20 | 19.3 | 18.6 | 18 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 27.1 | 27 | 27.1 | 26.9 | 26.7 | 26.7 | 26.7 | 26.3 | 26 | 25.8 | 25.4 | 25.5 | 25.2 | 25.2 | 25.1 | 24.5 | 24.5 | 24.2 | 24 | 23.9 | 23.6 | 23.3 | 22.9 | 22.3 | 21.8 |
| Nez Perce | Lewiston | µg/m³ | 31.4 | 31.4 | 31.4 | 31.4 | 31.2 | 30.9 | 30.6 | 30 | 29.3 | 28 | 26.8 | 26.5 | 26.1 | 25.7 | 25.4 | 25.2 | 24.8 | 24 | 23.7 | 23.3 | 22.9 | 22.7 | 22.3 | 22.1 | 21.6 |
| Shoshone | Pinehurst | µg/m³ | 22 | 22 | 21.8 | 21.6 | 21.4 | 21.1 | 20.7 | 20.5 | 20 | 19.5 | 19.1 | 18.9 | 19 | 18.5 | 18.4 | 18.2 | |||||||||
| Twin Falls | Twin Falls | µg/m³ | 27.5 | 25 | 25.8 | 26.4 | 26.7 | 27 | 27.5 | 27.4 | 26.5 | 25.4 | 24.2 | 23.5 | 22.7 | 22 | 21.2 | 20.8 | 20.6 | 20.1 | 19.8 | 19.1 | 18.3 | 17.4 | 16.9 | 16.2 | 15.7 |
