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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 | 3.5 | 2.5 | 2.3 | 2.2 | 2.1 | 2.1 | 2.1 | 2.2 | 2.3 | 2.4 | 2.5 | 2.5 | 2.5 | 2.5 | 2.4 | 2.4 | 2.4 | 2.5 | 2.8 | 3 | 3.1 | 3.1 | 3.2 | 3.3 | 3.5 |
| Boise | Idaho City | µg/m³ | 26.7 | 26.7 | 26.5 | 26.1 | 25.2 | 24.2 | 23.4 | 22.4 | 21.2 | 20 | 18.8 | 17.7 | 16.2 | 14.7 | 13.3 | 12.5 | 12 | 11 | 10.1 | 9.6 | 9.2 | 8.8 | 8.4 | 8 | 7.4 |
| Bonner | Sandpoint | µg/m³ | 187.8 | 187.6 | 187.8 | 187.4 | 186.5 | 184.7 | 183.2 | 180.2 | 173.3 | 164.9 | 155 | 145.7 | 136.5 | 128.4 | 121.1 | 114.7 | 109.2 | 103.7 | 98.5 | 93.3 | 88 | 83 | 76.4 | 70.7 | 66.2 |
| Bonneville | Idaho Falls | µg/m³ | 4 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.9 | 3.9 | 4 | 3.8 | 3.5 | 3.4 | 3.2 | 3.3 | 3.4 | 3.3 | 3.4 | 3.5 | 3.7 | 3.6 | 3.5 | 3.6 | 3.6 | 3.7 | 3.7 |
| Canyon | Nampa | µg/m³ | 20.9 | 19 | 18.8 | 18.9 | 19.2 | 19.6 | 20 | 20.3 | 20.5 | 20.8 | 20.9 | 20.5 | 19.7 | 18.5 | 17.1 | 15.6 | 14.4 | 13.2 | 11.8 | 10.5 | 9.5 | 9 | 8.5 | 7.7 | 7.5 |
| Kootenai | Coeur d'Alene | µg/m³ | 163.9 | 151.3 | 156 | 159.2 | 161.5 | 163.3 | 163.9 | 163.6 | 160.7 | 157.5 | 153 | 148.8 | 144.5 | 139.7 | 136.2 | 133 | 129.8 | 126 | 123 | 119.5 | 115.4 | 111.2 | 106.6 | 101.7 | 96.3 |
| Lemhi | Salmon | µg/m³ | 14.1 | 14.1 | 13.8 | 13.5 | 13 | 12.5 | 12.1 | 11.5 | 11 | 10.5 | 9.9 | 9.5 | 9 | 8.3 | 7.7 | 6.8 | 6.5 | 6.1 | 5.8 | 5.7 | 5.9 | 5.9 | 6 | 6 | 5.9 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 102 | 16.3 | 18.5 | 20.9 | 23.6 | 26.3 | 29.3 | 32.2 | 35.3 | 37.8 | 40.2 | 42 | 45 | 49.4 | 55.6 | 61.9 | 67.5 | 72.8 | 77.7 | 82.1 | 86.3 | 90.3 | 94.6 | 98.6 | 102 |
| Nez Perce | Lewiston | µg/m³ | 123.7 | 32 | 36.7 | 41.1 | 45.8 | 50 | 54.1 | 58.1 | 61.4 | 64.4 | 67.5 | 71.4 | 75.8 | 80.8 | 85.4 | 90.7 | 96.3 | 101.5 | 106.7 | 111.5 | 115.1 | 118.1 | 119.7 | 121.2 | 123.7 |
| Shoshone | Pinehurst | µg/m³ | 76.7 | 64.3 | 66.8 | 69.3 | 71 | 72.4 | 73.4 | 74.4 | 75.4 | 76.2 | 76.7 | 76.7 | 76.6 | 75.8 | 76 | 75.7 | 75.7 | 74.6 | 74 | 73.4 | 72.6 | 71.2 | 68.9 | 66.4 | 63.9 |
| Twin Falls | Twin Falls | µg/m³ | 12.6 | 12.2 | 12.5 | 12.5 | 12.6 | 12.5 | 12.1 | 11.7 | 11.2 | 10.1 | 9 | 8.1 | 7 | 6.2 | 5.5 | 4.7 | 4 | 3.8 | 3.7 | 3.6 | 3.6 | 3.7 | 3.7 | 3.7 | 3.7 |
