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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ada | Boise White Pine | µg/m³ | 84.5 | 14.8 | 15 | 15.7 | 16.7 | 17.6 | 18.5 | 19.9 | 21.7 | 24.7 | 29.4 | 35.2 | 40.2 | 43.9 | 48.1 | 52.1 | 55.5 | 58.5 | 62 | 65.9 | 70 | 73.8 | 77.5 | 81.3 | 84.5 |
| Bannock | Pocatello | µg/m³ | 15.3 | 4.1 | 4.2 | 4.2 | 4.3 | 4.2 | 4.3 | 4.3 | 4.5 | 4.6 | 4.8 | 5.3 | 5.8 | 6.5 | 7 | 7 | 7.3 | 7.7 | 7.8 | 8 | 8.3 | 9.9 | 12.1 | 13.7 | 15.3 |
| Benewah | St Maries PM2.5 | µg/m³ | 20 | 15.8 | 16 | 16.2 | 16.3 | 16.3 | 16.2 | 16.2 | 16.1 | 15.8 | 15.7 | 16 | 16.7 | 18.2 | 19.3 | 20 | 19.9 | 19.7 | 18.6 | 18.1 | 18.1 | 18.2 | 18.6 | 19.3 | 20 |
| Blaine | Ketchum | µg/m³ | 16.1 | 4.1 | 4.3 | 4.8 | 5.3 | 6.1 | 7 | 7.7 | 8.6 | 9.4 | 9.6 | 9.5 | 9.5 | 9.5 | 9.7 | 10 | 10.8 | 11.6 | 12.3 | 13 | 13.6 | 14.5 | 15.1 | 15.6 | 16.1 |
| Boise | Garden Valley | µg/m³ | 43.9 | 9.9 | 9.8 | 9.8 | 9.6 | 9.4 | 9.4 | 9.7 | 9.8 | 10.1 | 10.5 | 10.7 | 11.1 | 11.6 | 13.5 | 15.6 | 18.4 | 21.4 | 25 | 28.2 | 31.4 | 34.5 | 37.7 | 40.9 | 43.9 |
| Boise | Idaho City | µg/m³ | 43.4 | 12 | 12 | 11.9 | 11.9 | 12 | 12.3 | 12.5 | 13 | 13.7 | 14.7 | 15.5 | 16.3 | 18.4 | 20.3 | 22 | 23.7 | 24.4 | 26.9 | 29.8 | 32.5 | 35.6 | 38.3 | 41 | 43.4 |
| Bonner | Sandpoint | µg/m³ | 13.4 | 13.4 | 13.2 | 13 | 12.8 | 12.6 | 12.4 | 12 | 11.6 | 11.1 | 10.9 | 10.4 | 10.2 | 10 | 9.6 | 9.1 | 8.7 | 8.3 | 7.5 | 7 | 7.5 | 8 | 8.4 | 9 | 9.7 |
| Bonneville | Idaho Falls | µg/m³ | 7.4 | 6 | 6 | 6 | 6.1 | 6.1 | 6 | 6.2 | 6.2 | 6.1 | 6.3 | 6.2 | 6.2 | 6.3 | 6.4 | 6.5 | 6.5 | 6.6 | 6.7 | 6.9 | 4.5 | 4.8 | 4.9 | 5.6 | 7.4 |
| Boundary | Bonners Ferry | µg/m³ | 14.4 | 14.4 | 14.3 | 14 | 13.8 | 13.7 | 13.3 | 13 | 12.7 | 12.6 | 12.1 | 11.3 | 10.5 | 9.8 | 9.4 | 9.3 | 8.6 | 8 | 7.3 | 6.3 | 5.5 | 4.8 | 4.5 | 4.4 | 4.5 |
| Boundary | Mt Hall | µg/m³ | 17.8 | 17.8 | 16.8 | 15.9 | 15.2 | 14.4 | 13.7 | 13.1 | 12.8 | 12.4 | 11.5 | 9.9 | 8.8 | 8.4 | 8.1 | 7.8 | 7.4 | 7.1 | 6.5 | 5.7 | 4.9 | 4.2 | 4.3 | 4.7 | 5 |
| Boundary | Porthill | µg/m³ | 26.1 | 26.1 | 25.1 | 24.4 | 23.7 | 23 | 22.2 | 21.7 | 21.1 | 20 | 18.5 | 17.6 | 16.6 | 16.1 | 15.7 | 15.2 | 13.8 | 12.9 | 12.4 | 10.8 | 9.9 | 9.1 | 8 | 7.1 | 6.6 |
| Canyon | Nampa | µg/m³ | 118.5 | 18.1 | 20.5 | 23.4 | 25.8 | 29.4 | 33.7 | 38.5 | 43.5 | 50.4 | 58.3 | 63.2 | 68 | 72.1 | 76.8 | 81.1 | 85.5 | 89.3 | 93.1 | 96.8 | 100.5 | 104.9 | 109.9 | 114.5 | 118.5 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 31.3 | 27.2 | 26.9 | 26.1 | 25.7 | 25 | 24 | 23.5 | 22.7 | 21.9 | 21.7 | 22.4 | 23 | 23.7 | 24.5 | 24.9 | 26.2 | 27.1 | 28 | 29.2 | 29.5 | 30 | 30.4 | 30.7 | 31.3 |
| Franklin | Preston | µg/m³ | 3.2 | 2.1 | 2.1 | 2.1 | 2.2 | 2.2 | 2.2 | 2.4 | 2.5 | 2.6 | 2.6 | 2.5 | 2.3 | 2.2 | 2.5 | 2.5 | 2.5 | 2.6 | 2.5 | 2.5 | 2.6 | 2.6 | 2.7 | 2.8 | 3.2 |
| Idaho | Cottonwood | µg/m³ | 29.4 | 23 | 22.6 | 22.2 | 22 | 21.5 | 21.3 | 21 | 21.2 | 21.7 | 22.1 | 22.6 | 22.6 | 22.6 | 23.4 | 23.6 | 23.8 | 24.7 | 25.6 | 26.2 | 27 | 27.2 | 27.8 | 28.6 | 29.4 |
| Idaho | Grangeville | µg/m³ | 30 | 24.9 | 24.3 | 23.7 | 23.1 | 22.6 | 22 | 22.5 | 22.7 | 22.7 | 22.8 | 23.1 | 23.2 | 23.2 | 23.4 | 23.9 | 24.6 | 25 | 25.9 | 26.6 | 27.2 | 28.1 | 28.7 | 29.5 | 30 |
| Kootenai | Coeur d'Alene | µg/m³ | 15.8 | 11.7 | 11.7 | 11.7 | 11.6 | 11.4 | 11.1 | 10.9 | 10.6 | 10.4 | 10 | 9.7 | 9.7 | 10.5 | 11.7 | 12.2 | 12.3 | 11.6 | 10.6 | 10.6 | 11.4 | 12.4 | 13.3 | 14.4 | 15.8 |
| Latah | Juliaetta | µg/m³ | 32.8 | 19.4 | 19.7 | 20 | 18.6 | 19.6 | 19.1 | 18.9 | 18.6 | 18.4 | 19 | 20.2 | 22 | 23.7 | 25.2 | 26.4 | 27.6 | 28.6 | 29.5 | 29.6 | 29.4 | 29.3 | 30.6 | 31.4 | 32.8 |
| Latah | Troy | µg/m³ | 31.9 | 15.6 | 15.6 | 15.8 | 15.2 | 14.9 | 14.7 | 14.7 | 14.9 | 15.7 | 16.5 | 18.3 | 20.8 | 22.7 | 24.6 | 26.4 | 27.5 | 28.4 | 28.8 | 28.5 | 27.8 | 27.8 | 28.9 | 30.1 | 31.9 |
| Lemhi | Salmon | µg/m³ | 20.9 | 8.2 | 8.8 | 9.6 | 10.3 | 10.8 | 11.2 | 11.7 | 12.1 | 12.5 | 12.8 | 13.2 | 14 | 14.5 | 14.7 | 15 | 15.1 | 15.2 | 15.7 | 16.7 | 17.9 | 18.5 | 19.5 | 20.2 | 20.9 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 20.8 | 19.9 | 20 | 20.2 | 20.8 | ||||||||||||||||||||
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 35 | 28.9 | 28.5 | 28.5 | 27.9 | 27.5 | 27.2 | 27 | 26.5 | 25.7 | 24.8 | 24.4 | 25.1 | 27.1 | 29.5 | 30.7 | 30.9 | 31.2 | 32 | 32.7 | 33.7 | 34.2 | 34.2 | 34.4 | 35 |
| Madison | Rexburg | µg/m³ | 5 | 4 | 4 | 4 | 4 | 4.1 | 4.1 | 4 | 4.1 | 4.1 | 4.1 | 4.2 | 4.2 | 4.1 | 4.2 | 4.1 | 4.1 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.4 | 4.7 | 5 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 30.4 | 21.3 | 21.5 | 21.5 | 21.5 | 21.3 | 20.9 | 20.4 | 20 | 19.9 | 19.8 | 20.6 | 21.7 | 22.7 | 23.9 | 25.7 | 26.6 | 27.1 | 27.9 | 27.6 | 27.3 | 27.7 | 28.7 | 29.5 | 30.4 |
| Nez Perce | Lewiston | µg/m³ | 31.6 | 22.2 | 22.2 | 22.2 | 22 | 21.8 | 21.5 | 21.4 | 20.7 | 20.1 | 19.8 | 20 | 20.3 | 20.9 | 22.2 | 23.4 | 23.7 | 24.5 | 25 | 24.9 | 25.4 | 26.7 | 28 | 29.6 | 31.6 |
| Shoshone | Pinehurst | µg/m³ | 22.3 | 16.4 | 16.8 | 17.2 | 17.6 | 17.8 | 18.1 | 18.4 | 18.4 | 18.3 | 18.8 | 19.3 | 19.6 | 20.1 | 20.8 | 21.8 | 22.3 | 22 | 21.9 | 21.1 | 20.4 | 19.7 | 19.2 | 19.1 | 18.7 |
| Twin Falls | Twin Falls | µg/m³ | 72.7 | 4 | 4 | 4 | 4.3 | 4.6 | 5.6 | 6.7 | 8.6 | 11.5 | 16 | 21 | 25.3 | 29.9 | 34.5 | 38.9 | 42.6 | 46.3 | 51.1 | 54.6 | 58.6 | 62.3 | 63.5 | 68.1 | 72.7 |
| Valley | McCall | µg/m³ | 51.4 | 16.4 | 16.8 | 17.4 | 18.2 | 18.8 | 19.2 | 19.6 | 20.2 | 20.9 | 21.7 | 22.7 | 24.5 | 26.9 | 28.7 | 31.1 | 33.7 | 36.5 | 39 | 41.6 | 44 | 46.6 | 48.3 | 50.2 | 51.4 |
