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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 | 26 | 19.5 | 20.6 | 21.9 | 22.9 | 23.5 | 24.2 | 24.5 | 24.7 | 24.8 | 25.2 | 25.7 | 25.9 | 26 | 25.9 | 25.8 | 25.2 | 24.9 | 24.2 | 23.4 | 23 | 20.9 | 19.8 | 18.9 | 18.1 |
| Boise | Idaho City | µg/m³ | 123.4 | 106.7 | 110.1 | 113.7 | 116.6 | 119.2 | 121.2 | 122.1 | 122.2 | 123 | 123.4 | 120.6 | 116.2 | 113.4 | 112.5 | 111.4 | 109.6 | 107.7 | 108.1 | 109.5 | 110.9 | 112.5 | 113.4 | 113.5 | 114.2 |
| Bonneville | Idaho Falls | µg/m³ | 5.1 | 3.7 | 3.7 | 3.8 | 3.8 | 3.7 | 3.6 | 3.7 | 3.7 | 3.7 | 3.8 | 4 | 3.9 | 3.8 | 3.9 | 4 | 4.2 | 4.2 | 4.3 | 4.4 | 4.3 | 4.4 | 4.6 | 4.7 | 5.1 |
| Boundary | Bonners Ferry | µg/m³ | 2.5 | 2 | 2.1 | 1.9 | 2 | 2.1 | 2.1 | 2 | 2 | 2.2 | 2.1 | 2.5 | 2.3 | 2.2 | 2.2 | 2.3 | 2.3 | 2.2 | 2.1 | 2 | 1.8 | 1.7 | 1.7 | 1.6 | 1.7 |
| Canyon | Nampa | µg/m³ | 76 | 35.6 | 37.4 | 39.5 | 41.9 | 44.8 | 47.6 | 50.5 | 53.6 | 57 | 58.2 | 61.4 | 63.7 | 65.4 | 67.3 | 68.8 | 70 | 71.1 | 72.4 | 73.5 | 74 | 73.3 | 73 | 73.9 | 76 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 9.1 | 2.7 | 2.7 | 2.5 | 2.6 | 2.5 | 2.9 | 2.8 | 3 | 3.2 | 4.3 | 5.2 | 6.1 | 6.7 | 7.2 | 7.4 | 7.6 | 7.7 | 7.8 | 8.2 | 8.4 | 8.5 | 9 | 9.1 | 9 |
| Idaho | Cottonwood | µg/m³ | 11.4 | 9.3 | 9.5 | 9.7 | 9.9 | 10 | 10.2 | 10.4 | 10.6 | 10.9 | 11.2 | 11.4 | 11.2 | 10.6 | 10.8 | 10.5 | 10.7 | 10.3 | 9.9 | 9.5 | 9.1 | 9 | 9 | 9 | 9.3 |
| Idaho | Grangeville | µg/m³ | 9.8 | 7.7 | 8 | 8.3 | 8.4 | 8.7 | 8.8 | 9.1 | 9.4 | 9.4 | 9.5 | 9.6 | 9.8 | 9.8 | 7.2 | 6.6 | 6.6 | 7 | 7.2 | 7.4 | 7.6 | 7.6 | 7.7 | 7.3 | 7.3 |
| Kootenai | Coeur d'Alene | µg/m³ | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.3 | 4.4 | 4.4 | 4.3 | 4.5 | 4.6 | 4.6 | 4.6 | 4.6 | 4.7 | 4.7 | 4.7 | 4.3 | 4.4 | 4.4 |
| Latah | Juliaetta | µg/m³ | 6.7 | 4.3 | 4.4 | 4.5 | 4.5 | 4.6 | 4.8 | 4.5 | 4.7 | 4.7 | 5.3 | 6.1 | 5.5 | 5.8 | 6 | 6.2 | 6.1 | 6 | 6.4 | 6.4 | 6.5 | 6.6 | 6.7 | 6.7 | 6.7 |
| Lemhi | Salmon | µg/m³ | 29.3 | 9.1 | 9 | 8.8 | 8.6 | 8.3 | 8.2 | 7.9 | 7.7 | 7.6 | 7.6 | 7.2 | 7.8 | 9.4 | 9.9 | 11.3 | 13.2 | 15.5 | 17.7 | 19.8 | 22 | 23.8 | 25.7 | 27.4 | 29.3 |
| Lewis | Nezperce - Nez Perce Tribe | µg/m³ | 13.8 | 10.2 | 10 | 10.4 | 10.6 | 10.8 | 11.4 | 11.5 | 11 | 11.2 | 11.3 | 11.6 | 12.2 | 13 | 12.3 | 12.2 | 12.3 | 12.8 | 12.5 | 13.4 | 13.5 | 13.8 | 13.8 | 13.8 | 13.6 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 12.9 | 7.8 | 7.7 | 7.9 | 8.2 | 8.6 | 9.1 | 8.9 | 9.1 | 10 | 10.4 | 11.3 | 11.7 | 12.9 | 12.5 | 12.5 | 12.5 | 12.4 | 12.2 | 12.1 | 11.9 | 11.9 | 11.7 | 11.8 | 11.8 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 14.1 | 8.4 | 8 | 8.1 | 8 | 8.1 | 8 | 8.1 | 8.7 | 8.9 | 9 | 10.9 | 12.3 | 13 | 14 | 13.7 | 13.9 | 14.1 | 13.6 | 13.5 | 12.9 | 13 | 12.8 | 12.5 | 12.3 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 6.3 | 5.2 | 5.3 | 5 | 5.1 | 5.1 | 5.4 | 5.6 | 5.6 | 5.6 | 5.7 | 6 | 5.8 | 5.9 | 6 | 6.1 | 6.3 | 6 | 5.9 | 6.2 | 6.2 | 6 | 6 | 6.1 | 6.1 |
| Nez Perce | Lewiston | µg/m³ | 9.7 | 6.6 | 6.8 | 7 | 7.1 | 7 | 7.1 | 7.3 | 8.7 | 9 | 9.2 | 9.4 | 9.4 | 9.4 | 9.4 | 9.5 | 9.5 | 9.6 | 9.7 | 9.7 | 9.5 | 9.5 | 9.3 | 9.3 | 9.2 |
| Shoshone | Pinehurst | µg/m³ | 4.7 | 4.7 | 4.7 | 4.7 | 4.5 | 4.5 | 4.4 | 4.2 | 4.3 | 4.3 | 4.2 | 4.1 | 4 | 4 | 4.2 | 4 | 3.9 | 4 | 4.2 | 4.3 | 4 | 3.8 | 3.8 | 3.9 | 4.1 |
| Twin Falls | Twin Falls | µg/m³ | 76 | 45.2 | 47.7 | 50.3 | 52.9 | 56.1 | 59.6 | 62.7 | 65.9 | 68.1 | 70.7 | 72.5 | 73.7 | 74.9 | 75.7 | 76 | 76 | 75.1 | 73.5 | 71.9 | 69.9 | 66.6 | 62.7 | 59 | 56.4 |
