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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 | 79.2 | 79.2 | 78.9 | 78.3 | 77.3 | 76.5 | 75.4 | 73.8 | 71.1 | 67.7 | 62.9 | 59.1 | 56 | 53.2 | 51.1 | 49.1 | 47.7 | 46.3 | 45 | 43.6 | 42 | 40.3 | 38.7 | 37.3 | 35.8 |
| Bannock | Pocatello | µg/m³ | 9.9 | 9.9 | 9.7 | 9.5 | 9.4 | 9 | 8.8 | 8.7 | 8.7 | 8.7 | 8.6 | 8.6 | 8.5 | 7.8 | 7.6 | 7.4 | 7 | 7.1 | 7.1 | 7 | 7 | 7 | 6.9 | 6.8 | 6.9 |
| Benewah | St Maries PM2.5 | µg/m³ | 25 | 25 | 24.8 | 24.8 | 24.6 | 24.7 | 24.7 | 24.7 | 24.5 | 24.9 | 24.7 | 24.6 | 24.6 | 24.4 | 23.8 | 24 | 24.2 | 24.2 | 24.5 | 24.4 | 24.7 | 24.9 | 25 | 25 | 24.9 |
| Blaine | Ketchum | µg/m³ | 12.5 | 12.5 | 12.2 | 12 | 11.8 | 11.5 | 11 | 10.5 | 10.1 | 9.5 | 9.1 | 9 | 9 | 8.9 | 9 | 9.3 | 9.4 | 9.5 | 9.5 | 9.3 | 9.3 | 9.1 | 8.7 | 8.5 | 8.2 |
| Boise | Garden Valley | µg/m³ | 51 | 51 | 50.8 | 50.4 | 50.2 | 50 | 49.7 | 49.3 | 48.7 | 48.2 | 48.3 | 48.3 | 48.5 | 48.3 | 47.9 | 46.6 | 45.2 | 43.8 | 42.5 | 40.8 | 39.4 | 38.3 | 37 | 36.1 | 34.8 |
| Boise | Idaho City | µg/m³ | 49.7 | 48.1 | 48.5 | 48.7 | 49.2 | 49.6 | 49.7 | 49.5 | 49.4 | 49.2 | 48.7 | 48.3 | 47.2 | 45.5 | 44 | 42.3 | 40.9 | 39 | 37.5 | 35.7 | 34.3 | 32.7 | 31.4 | 30 | 28.6 |
| Bonner | Sandpoint | µg/m³ | 20 | 16.6 | 16.9 | 17.3 | 17.7 | 17.8 | 18.2 | 18.2 | 18 | 18 | 18.3 | 18.1 | 17.7 | 17.3 | 17.1 | 16.8 | 16.5 | 16.2 | 16.2 | 16.7 | 17.3 | 18 | 18.8 | 19.4 | 20 |
| Bonneville | Idaho Falls | µg/m³ | 7.4 | 6.3 | 6.1 | 6.1 | 6.1 | 6 | 6 | 6 | 6.1 | 5.9 | 5.5 | 5.7 | 6 | 6.1 | 5.9 | 6 | 6.4 | 7 | 7.4 | 7.1 | 6.7 | 6.6 | 6.7 | 6.8 | 7 |
| Boundary | Bonners Ferry | µg/m³ | 21 | 15.8 | 15.9 | 16.1 | 16.3 | 16.5 | 16.6 | 16.8 | 17.1 | 17.6 | 17.6 | 17.9 | 18.3 | 18.2 | 17.9 | 17.4 | 16.9 | 17 | 17.4 | 18 | 18.7 | 19.3 | 19.8 | 20.4 | 21 |
| Boundary | Mt Hall | µg/m³ | 21.9 | 12.5 | 13 | 13.7 | 14.2 | 14.9 | 15.9 | 16.4 | 16.9 | 17.5 | 18.4 | 18.7 | 18.6 | 18.6 | 18.6 | 18.3 | 18.1 | 18.4 | 19.1 | 19.7 | 20.3 | 20.7 | 21.2 | 21.5 | 21.9 |
| Boundary | Porthill | µg/m³ | 48.1 | 35.3 | 36.9 | 38.4 | 39.8 | 41 | 42 | 43.3 | 44.5 | 46.4 | 47.8 | 48.1 | 48 | 47.8 | 46.9 | 45.8 | 44.5 | 44.1 | 43.9 | 43.7 | 43.5 | 41.6 | 37.4 | 34.4 | 34.2 |
| Canyon | Nampa | µg/m³ | 84.5 | 84.5 | 82.9 | 81.9 | 81.3 | 81 | 80.5 | 80.5 | 80.5 | 79.2 | 76.3 | 73.6 | 71.5 | 69 | 66.8 | 64.7 | 62.5 | 61.1 | 60 | 59.2 | 58.4 | 57.5 | 57.2 | 57 | 56.8 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 25.1 | 24.7 | 24 | 23.7 | 23 | 22 | 21.6 | 21.1 | 20.9 | 20.7 | 20.9 | 21.1 | 21.1 | 21.8 | 21.8 | 22.1 | 22 | 22.2 | 22 | 23.2 | 23.9 | 24.2 | 24.4 | 24.9 | 25.1 |
| Franklin | Preston | µg/m³ | 7.9 | 6.7 | 6.7 | 6.7 | 6.6 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.7 | 6.8 | 6.9 | 7.2 | 7.3 | 7.9 | 7.8 | 7.7 | 7.5 | 7.4 | 7.2 | 7.2 | 7.2 | 7.2 |
| Idaho | Cottonwood | µg/m³ | 25.2 | 19.1 | 18.7 | 18.5 | 18.2 | 18.1 | 18.2 | 18.7 | 20.3 | 21.1 | 21.8 | 22.1 | 22.5 | 22.6 | 22.8 | 23.1 | 23.4 | 23.5 | 24 | 24.4 | 24.8 | 25.2 | 25.2 | 25 | 25.1 |
| Idaho | Grangeville | µg/m³ | 24.1 | 24.1 | 23.5 | 22.9 | 22.4 | 21.8 | 21.2 | 20.6 | 20.3 | 20.4 | 20.5 | 20.5 | 20.4 | 20.5 | 20.5 | 20.7 | 20.9 | 21 | 21.3 | 21.4 | 21.8 | 22.1 | 22.7 | 22.7 | 23 |
| Kootenai | Coeur d'Alene | µg/m³ | 20.1 | 18.5 | 18.9 | 19 | 19.3 | 19.6 | 19.9 | 20.1 | 20 | ||||||||||||||||
| Latah | Juliaetta | µg/m³ | 25.7 | 22.9 | 22.8 | 22.5 | 22.3 | 21.7 | 21.8 | 21.8 | 22.2 | 22.8 | 23.3 | 24 | 24.4 | 24.2 | 24.6 | 24.6 | 24.6 | 25.3 | 25.6 | 25.7 | 25.5 | 25.5 | 25.2 | 25.1 | 25.3 |
| Latah | Troy | µg/m³ | 22.4 | 16.6 | 17.1 | 17.8 | 17.6 | 17.7 | 17.9 | 18.5 | 18.9 | 19.5 | 19.3 | 19.6 | 20 | 20.6 | 21.1 | 21.4 | 21.8 | 22.4 | 22.1 | 21.8 | 21.4 | 21.3 | 21.5 | 21.2 | 20.9 |
| Lemhi | Salmon | µg/m³ | 24.7 | 24.7 | 24 | 23.6 | 22.8 | 21.9 | 20.9 | 20.3 | 19.2 | 18.4 | 17.4 | 16.3 | 15.3 | 14.3 | 13.2 | 12.8 | 12.7 | 12.8 | 12.9 | 13.1 | 13.3 | 13.5 | 13.7 | 13.7 | 14 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 24.7 | 15.8 | 15.5 | 14.5 | 14.4 | 14.6 | 15.2 | 15.9 | 17.3 | 18.1 | 19.2 | 19.9 | 20.8 | 20.9 | 21.3 | 21.6 | 22 | 21.8 | 22.6 | 23.4 | 23.5 | 23.9 | 24 | 24.2 | 24.7 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 26 | 26 | 25.2 | 24.4 | 23.6 | 23 | 22.1 | 21.6 | 20.8 | 20.3 | 20.2 | 20.3 | 20.9 | 20.1 | 20.1 | 20 | 20 | 20.4 | 20.8 | 21 | 21.5 | 21.7 | 22 | 22.2 | 22.4 |
| Madison | Rexburg | µg/m³ | 8.8 | 6 | 5.9 | 6.1 | 6 | 6.1 | 6.2 | 6.2 | 6.2 | 6 | 5.9 | 5.7 | 5.9 | 6.3 | 6.2 | 6.3 | 6.8 | 7.3 | 8.1 | 8.3 | 8.6 | 8.7 | 8.4 | 8.8 | 8.7 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 25.2 | 20.8 | 20 | 18.9 | 18 | 17.5 | 17.1 | 16.8 | 17.1 | 17.7 | 18.5 | 19.4 | 20 | 20.5 | 21.2 | 21.6 | 21.9 | 22.7 | 23.4 | 23.7 | 23.7 | 24.1 | 24.3 | 24.8 | 25.2 |
| Nez Perce | Lewiston | µg/m³ | 30.1 | 23.4 | 22.3 | 21.7 | 21.2 | 21 | 20.3 | 20.4 | 20.7 | 21.7 | 22.5 | 23.5 | 24.7 | 25.3 | 26.1 | 27 | 27.7 | 28.3 | 28.4 | 28.2 | 28.4 | 28.4 | 28.7 | 29.2 | 30.1 |
| Shoshone | Pinehurst | µg/m³ | 25 | 22.5 | 22.7 | 23 | 22.9 | 23.2 | 23.3 | 23.8 | 24 | 24.2 | 24.5 | 24.9 | 25 | 25 | 25 | 25 | 24.9 | 24.4 | 24.2 | 24.5 | 24.3 | 24.5 | 24.7 | 24.8 | 24.8 |
| Twin Falls | Twin Falls | µg/m³ | 51.5 | 51.5 | 50.5 | 49.4 | 47.9 | 46.2 | 44.5 | 42.4 | 39.1 | 35.3 | 31.9 | 28.3 | 25.1 | 22.2 | 19.8 | 18.1 | 16.2 | 15.1 | 14.4 | 13.4 | 12 | 11.1 | 10.3 | 9.2 | 9.2 |
| Valley | McCall | µg/m³ | 28.8 | 28.5 | 28.7 | 28.6 | 28.7 | 28.6 | 28.7 | 28.8 | 28.7 | 28.6 | 28.7 | 28.8 | 28.2 | 27.4 | 26.7 | 26.4 | 26.4 | 26.5 | 26.2 | 26 | 26.2 | 26.3 | 26.2 | 26.2 | 26.3 |

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