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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 | 3.8 | 3.8 | 3.7 | 3.7 | 3.6 | 3.5 | 3.3 | 3.2 | 3.1 | 2.9 | 2.7 | 2.5 | 2.5 | 2.6 | 2.5 | 2.2 | 1.8 | 1.7 | 1.7 | 1.4 | 1.2 | 1 | 0.9 | 1 | 1 |
| Boise | Idaho City | µg/m³ | 3.6 | 3.6 | 3.3 | 3.2 | 3 | 3 | 2.9 | 3 | 3 | 3.1 | 3.1 | 3.2 | 3.3 | 3.2 | 3.1 | 3.1 | 3.1 | 2.9 | 2.8 | 2.8 | 2.9 | 3 | 3 | 3.1 | 3 |
| Bonner | Sandpoint | µg/m³ | 47.3 | 47.3 | 45.6 | 44.1 | 42.4 | 40.6 | 38.6 | 36.3 | 34.4 | 32.8 | 30.8 | 29 | 27.6 | 25.5 | 23.9 | 22.7 | 21.4 | 21.4 | 22.6 | 23.6 | 24.7 | 25.9 | 26.5 | 27.3 | 28.4 |
| Bonneville | Idaho Falls | µg/m³ | 3.7 | 3.6 | 3.7 | 3.7 | 3.6 | 3.6 | 3.5 | 3.4 | 3.3 | 3.2 | 3 | 2.9 | 2.7 | 2.6 | 2.5 | 2.4 | 2.4 | 2.4 | 2.3 | 2.1 | 2 | 2 | 2 | 1.9 | 1.9 |
| Canyon | Nampa | µg/m³ | 4.5 | 3.8 | 3.6 | 3.5 | 3.5 | 3.6 | 3.7 | 4 | 4.1 | 4.3 | 4.4 | 4.4 | 4.3 | 4.3 | 4.1 | 4.1 | 4.1 | 4.2 | 4.4 | 4.5 | 4.5 | 4.4 | 4.3 | 4.5 | 4.4 |
| Kootenai | Coeur d'Alene | µg/m³ | 37.3 | 37.3 | 35 | 32.6 | 30.3 | 27.9 | 25.5 | 23 | 22.1 | 20.7 | 19.4 | 18.5 | 17.1 | 15.9 | 14.8 | 15.7 | 16.9 | 18.3 | 19.8 | 21.4 | 22.9 | 24.4 | 26 | 27.4 | 28.7 |
| Lemhi | Salmon | µg/m³ | 3.8 | 3.8 | 3.7 | 3.7 | 3.5 | 3.5 | 3.6 | 3.5 | 3.6 | 3.6 | 3.6 | 3.6 | 3.5 | 3.2 | 3.1 | 3.1 | 3 | 2.7 | 2.5 | 2.5 | 2.5 | 2.5 | 2.6 | 2.6 | 2.7 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 14 | 14 | 11.2 | 8.8 | |||||||||||||||||||||
| Nez Perce | Lewiston | µg/m³ | 37.9 | 28.9 | 23.5 | 19 | 14.1 | 9.9 | 7.7 | 8.4 | 10.6 | 12.4 | 13.9 | 15.3 | 17 | 18.7 | 19.7 | 20.9 | 22.2 | 24.2 | 26 | 27.5 | 29.3 | 31.2 | 33.3 | 35.6 | 37.9 |
| Shoshone | Pinehurst | µg/m³ | 31.2 | 18.9 | 18 | 17.3 | 16.3 | 15.7 | 14.7 | 14 | 13.5 | 13.2 | 13.8 | 14.6 | 15.6 | 16.3 | 17.6 | 19 | 20.2 | 21.4 | 22.6 | 23.5 | 24.9 | 26.2 | 27.5 | 29.3 | 31.2 |
| Twin Falls | Twin Falls | µg/m³ | 2.6 | 2.5 | 2.5 | 2.5 | 2.6 | 2.6 | 2.6 | 2.4 | 2.3 | 2.2 | 2 | 1.9 | 1.8 | 1.6 | 1.4 | 1.4 | 1.4 | 1.4 | 1.5 | 1.7 | 1.8 | 1.8 | 1.7 | 1.8 | 2 |
