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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 | 4.8 | 3.5 | 3.5 | 3.6 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.9 | 4.1 | 4.2 | 4.2 | 4.1 | 4.2 | 4.5 | 4.8 | 4.7 | 4.4 | 4.5 | 4.6 | 4.5 | 4.4 | 4.2 | 4 |
| Boise | Idaho City | µg/m³ | 7 | 7 | 6.7 | 6.3 | 6.1 | 5.8 | 5.4 | 5 | 4.6 | 4.4 | 4.3 | 4.2 | 4.2 | 4.2 | 4.3 | 4.5 | 4.5 | 4.6 | 4.5 | 4.4 | 4.3 | 4.2 | 4 | 3.8 | 3.8 |
| Bonner | Sandpoint | µg/m³ | 62 | 62 | 58.8 | 56.2 | 54.7 | 54.1 | 53.9 | 54 | 54.6 | 55.6 | 57 | 58.4 | 59.5 | 60.3 | 60.9 | 61.1 | 61.5 | 61 | 59.4 | 57.7 | 56 | 54.1 | 52.5 | 50.7 | 48.7 |
| Bonneville | Idaho Falls | µg/m³ | 4.1 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.4 | 3.4 | 3.2 | 3.4 | 3.6 | 3.7 | 4 | 4.1 | 4 | 4.1 | 3.9 | 3.7 | 3.5 | 3.6 | 3.6 | 3.5 | 3.5 | 3.6 | 3.7 |
| Canyon | Nampa | µg/m³ | 7.1 | 7.1 | 6.7 | 6.5 | 6 | 5.5 | 4.9 | 4.5 | 4.3 | 3.9 | 3.7 | 3.7 | 3.5 | 3.5 | 3.8 | 4.1 | 4.2 | 4.2 | 4.3 | 4.6 | 4.6 | 4.5 | 4.2 | 4 | 3.9 |
| Kootenai | Coeur d'Alene | µg/m³ | 89.7 | 89.7 | 83.9 | 79.1 | 74.8 | 70.9 | 67.8 | 65.8 | 65.1 | 64.6 | 64.5 | 63.7 | 63.2 | 62.2 | 61.5 | 61 | 58.2 | 55.8 | 53.3 | 50.5 | 47.9 | 45.3 | 43 | 40.9 | 39.3 |
| Lemhi | Salmon | µg/m³ | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.5 | 5.5 | 5.2 | 4.9 | 4.7 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.5 | 4.6 | 4.5 | 4.4 | 4.2 | 4.1 | 4 | 3.9 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 105.3 | 104.8 | 105.3 | 105 | 103.5 | 101.5 | 99.1 | 96.4 | 93.2 | 90.2 | 87.6 | 85.6 | 82.1 | 77.5 | 71 | 65 | 59 | 53.5 | 48.1 | 43 | 37.7 | 32.5 | 28.1 | 23.4 | 18.7 |
| Nez Perce | Lewiston | µg/m³ | 125.8 | 125.4 | 125.8 | 125.7 | 125.7 | 125.5 | 123.7 | 120.2 | 116.5 | 113.2 | 109.8 | 106 | 101.5 | 96.2 | 94.9 | 89.3 | 83.2 | 77 | 71 | 64.8 | 58.8 | 52.6 | 46.9 | 40.7 | 34.6 |
| Shoshone | Pinehurst | µg/m³ | 61.4 | 61.4 | 59.1 | 56.6 | 54.3 | 52 | 50 | 47.5 | 45.2 | 42.9 | 40.6 | 38.3 | 35.7 | 33.6 | 31 | 29 | 27.8 | 26.8 | 25.4 | 24.4 | 23 | 22 | 21.3 | 20.5 | 19.7 |
| Twin Falls | Twin Falls | µg/m³ | 3.7 | 3.7 | 3.2 | 2.8 | 2.3 | 2.1 | 2.1 | 2.4 | 2.7 | 2.9 | 3 | 2.9 | 3 | 3.2 | 3.2 | 3.2 | 3.3 | 3.2 | 3 | 2.8 | 2.7 | 2.7 | 2.7 | 2.6 | 2.5 |
