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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 | 17.3 | 17.3 | 16.8 | 15.9 | 15.3 | 14.9 | 14.5 | 14.5 | 14.3 | 14.4 | 14.3 | 13.9 | 13.8 | 13.9 | 14 | 13.9 | 14 | 14 | 13.6 | 13.5 | 13.3 | 13.2 | 13.1 | 13 | 12.9 |
| Boise | Idaho City | µg/m³ | 132.5 | 114.8 | 115.6 | 115.9 | 116.9 | 117.2 | 117.8 | 118 | 118.7 | 120.2 | 122.4 | 125 | 129.2 | 132.5 | 132 | 130.8 | 129.4 | 127.7 | 123.6 | 119.5 | 116.2 | 113.9 | 112.3 | 111.2 | 109.8 |
| Bonneville | Idaho Falls | µg/m³ | 8.5 | 5.5 | 5.7 | 5.9 | 6.1 | 6.4 | 6.6 | 6.6 | 6.7 | 6.9 | 6.9 | 7 | 7.2 | 7.4 | 7.5 | 7.8 | 7.9 | 8.1 | 8.1 | 8.1 | 8.3 | 8.3 | 8.3 | 8.5 | 8.3 |
| Boundary | Bonners Ferry | µg/m³ | 2.3 | 1.6 | 1.7 | 1.7 | 1.6 | 1.7 | 1.6 | 1.8 | 2.2 | 2.1 | 2 | 2 | 2 | 2.1 | 2 | 1.9 | 1.8 | 2 | 2.3 | 2.3 | 2.1 | 2.2 | 2.1 | 2 | 1.9 |
| Canyon | Nampa | µg/m³ | 92.7 | 77.5 | 79 | 80.2 | 81.5 | 82.4 | 83.7 | 84.4 | 85.4 | 86.5 | 87.4 | 88.2 | 88.5 | 88.9 | 89.2 | 89.5 | 89.9 | 90.4 | 90.8 | 91 | 91.5 | 91.9 | 92.2 | 92.4 | 92.7 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 13.5 | 9.4 | 9.5 | 9.7 | 9.7 | 9.9 | 9.8 | 10 | 10 | 10 | 10.5 | 12.3 | 13.2 | 13.5 | 13.4 | 13.1 | 13 | 13 | 13 | 12.7 | 12.6 | 12.5 | 12.5 | 12.4 | 12.5 |
| Idaho | Cottonwood | µg/m³ | 19.6 | 9.1 | 9.2 | 9.1 | 8.9 | 8.8 | 8.9 | 9 | 9.5 | 10.5 | 11.6 | 11.9 | 13.2 | 17.4 | 18.4 | 19 | 19.3 | 19.5 | 19.6 | 19.4 | 19.5 | 19.5 | 19.4 | 19.5 | 19.5 |
| Idaho | Grangeville | µg/m³ | 11.3 | 7.2 | 7.2 | 7.1 | 7.1 | 7.1 | 7.3 | 7.2 | 7.3 | 7.6 | 7.7 | 7.8 | 7.9 | 8.1 | 8.5 | 9.2 | 9.7 | 10 | 10.2 | 10.3 | 10.3 | 10.5 | 10.9 | 11.3 | 11.1 |
| Kootenai | Coeur d'Alene | µg/m³ | 5.2 | 4.5 | 4.6 | 4.5 | 4.5 | 4.7 | 4.9 | 5 | 5.1 | 5.2 | 5.1 | 4.9 | 4.8 | 5 | 5.2 | 5.1 | 5 | 4.9 | 4.7 | 4.7 | 4.7 | 4.7 | 4.9 | 4.8 | 5 |
| Latah | Juliaetta | µg/m³ | 12.5 | 6.8 | 6.8 | 7 | 7 | 7 | 6.9 | 7.1 | 7 | 6.9 | 7.1 | 7.8 | 9.9 | 11.6 | 12.1 | 12.2 | 12.3 | 12.5 | 12 | 12.1 | 12 | 12 | 12.1 | 12 | 12.1 |
| Lemhi | Salmon | µg/m³ | 47.5 | 31.3 | 33.1 | 34.9 | 36.6 | 38 | 39.3 | 40.7 | 42 | 43.4 | 44.8 | 46.3 | 46.9 | 46.5 | 47.5 | 47.2 | 46.6 | 45.8 | 45 | 44.3 | 43.7 | 43.5 | 43.3 | 43.2 | 43 |
| Lewis | Nezperce - Nez Perce Tribe | µg/m³ | 28.3 | 13.8 | 14.1 | 13.7 | 13.7 | 14.1 | 15 | 15.2 | 15.7 | 17.1 | 18.3 | 25.8 | 28 | 28.2 | 27.9 | 28 | 27.9 | 27.6 | 28 | 27.4 | 27.4 | 27.5 | 27.7 | 28.1 | 28.3 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 16.8 | 11.9 | 11.9 | 11.9 | 11.8 | 11.6 | 11.7 | 11.7 | 11.6 | 10.2 | 10.7 | 10.8 | 11.8 | 11.5 | 13.1 | 13.7 | 14.1 | 14.2 | 14.5 | 15 | 15.3 | 15.7 | 16 | 16.4 | 16.8 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 21.2 | 12.5 | 12.7 | 12.7 | 13 | 12.6 | 12.8 | 12.6 | 12.4 | 12.2 | 12.4 | 13.7 | 15.7 | 17 | 18.7 | 20.1 | 20 | 20.1 | 20.1 | 20.3 | 20.1 | 20.3 | 20.7 | 21 | 21.2 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 13.5 | 6.2 | 6.2 | 6.6 | 6.5 | 6.7 | 6.8 | 6.7 | 6.5 | 6.7 | 6.6 | 7 | 7.2 | 8.1 | 9 | 9.5 | 9.9 | 10.5 | 10.9 | 11.2 | 11.7 | 12.1 | 12.4 | 13 | 13.5 |
| Nez Perce | Lewiston | µg/m³ | 14.1 | 9.1 | 9 | 9 | 9.2 | 9.4 | 9.6 | 9.5 | 8.1 | 7.9 | 7.7 | 8 | 8.5 | 9.1 | 10 | 10.7 | 11.1 | 11.5 | 11.8 | 12.1 | 12.7 | 13 | 13.5 | 13.8 | 14.1 |
| Shoshone | Pinehurst | µg/m³ | 4.4 | 4 | 3.9 | 4 | 4.2 | 4.2 | 4.2 | 4.3 | 4.4 | 4.2 | 4.1 | 4.1 | 4.1 | 4 | 3.8 | 3.8 | 4 | 3.8 | 3.6 | 3.6 | 3.7 | 4.2 | 4.3 | 4.4 | 4.4 |
| Twin Falls | Twin Falls | µg/m³ | 54.5 | 54.5 | 52.6 | 51 | 49.5 | 47.3 | 44.9 | 42.8 | 40.6 | 39 | 37.7 | 37.3 | 37 | 36.5 | 35.5 | 34.5 | 33.8 | 33.4 | 32.7 | 31.8 | 30.8 | 30 | 29.5 | 28.9 | 28.3 |
