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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 | 50.5 | 33.5 | 35.6 | 37.5 | 39.3 | 40.4 | 40.9 | 41.5 | 41.5 | 41.5 | 41.7 | 42.5 | 43.4 | 44.1 | 45 | 45.3 | 45.4 | 45.5 | 45.9 | 46.8 | 47.8 | 48.8 | 49.5 | 49.9 | 50.5 |
| Bannock | Pocatello | µg/m³ | 13.3 | 8.5 | 8.9 | 9.2 | 9.7 | 9.9 | 10 | 10.5 | 10.8 | 11 | 11.2 | 11.4 | 11.9 | 12.2 | 12.5 | 12.4 | 12.4 | 12.5 | 12.6 | 12.7 | 12.9 | 13.2 | 13.3 | 13.3 | 13.1 |
| Benewah | St Maries PM2.5 | µg/m³ | 14.9 | 11 | 11.1 | 11.1 | 11.2 | 11.4 | 11.5 | 11.8 | 12.1 | 12.3 | 12.4 | 12.6 | 12.5 | 12.5 | 12.3 | 12.1 | 12.2 | 12.1 | 12.2 | 12.5 | 12.8 | 13.1 | 13.7 | 14.2 | 14.9 |
| Blaine | Ketchum | µg/m³ | 6.3 | 4.8 | 4.9 | 5.2 | 5.4 | 5.5 | 5.5 | 5.7 | 6.1 | 6.1 | 6 | 5.9 | 5.7 | 5.6 | 5.4 | 5.4 | 5.1 | 5.4 | 5.6 | 5.7 | 5.6 | 6.1 | 6.3 | 6.2 | 5.9 |
| Boise | Garden Valley | µg/m³ | 20.3 | 20.3 | 20.1 | 19.9 | 19.6 | 19.3 | 18.9 | 18.7 | 18.5 | 18.5 | 18.4 | 18.2 | 18.1 | 18.2 | 18.5 | 18.8 | 19.1 | 19.4 | 19.3 | 19.5 | 19.6 | 19.6 | 19.6 | 19.7 | 19.8 |
| Boise | Idaho City | µg/m³ | 15.5 | 14.5 | 14.4 | 14.1 | 14.1 | 13.9 | 13.8 | 14.1 | 14.2 | 14.6 | 14.7 | 14.7 | 14.7 | 14.7 | 15 | 15 | 15 | 15.2 | 15.1 | 15.1 | 15.2 | 15.2 | 15.3 | 15.4 | 15.5 |
| Bonner | Sandpoint | µg/m³ | 25 | 23.7 | 23.9 | 24.2 | 24.5 | 24.7 | 24.8 | 24.9 | 24.8 | 24.7 | 24.9 | 24.9 | 25 | 24.7 | 24.5 | 24.4 | 24.6 | 24.5 | 24.4 | 24.5 | 24.3 | 24.2 | 24 | 23.7 | 23.5 |
| Bonneville | Idaho Falls | µg/m³ | 12 | 7 | 7.3 | 7.8 | 8.1 | 8.9 | 9.2 | 9.5 | 10.1 | 10.5 | 10.6 | 10.9 | 11 | 11.2 | 11.4 | 11.7 | 11.8 | 12 | 12 | 11.8 | 11.9 | 11.9 | 11.9 | 11.7 | 11.5 |
| Boundary | Bonners Ferry | µg/m³ | 20.8 | 17 | 17.4 | 17.9 | 18.2 | 18.6 | 19.1 | 19.5 | 20.1 | 20.6 | 20.7 | 20.5 | 20.4 | 20.5 | 20.5 | 20.3 | 20.5 | 20.4 | 20.4 | 20.4 | 20.8 | 20.6 | 20.1 | 19.6 | 19.4 |
| Boundary | Mt Hall | µg/m³ | 17.7 | 17.2 | 17.3 | 17.4 | 17.1 | 17.2 | 17.1 | 17.1 | 17.2 | 17.1 | 17.2 | 17.1 | 17.3 | 17.4 | 17.7 | 17.5 | 17.4 | 17.5 | 17.3 | 17.1 | 16.7 | 16.4 | 16 | 15.7 | 15.6 |
| Boundary | Porthill | µg/m³ | 16.1 | 12.2 | 12.1 | 11.8 | 12.1 | 12.3 | 12.1 | 12 | 12.1 | 12.1 | 12.1 | 12 | 12.2 | 12.4 | 12.5 | 12.9 | 13 | 13.1 | 13.2 | 13.4 | 13.5 | 14.6 | 15.4 | 16 | 16.1 |
| Canyon | Nampa | µg/m³ | 58.2 | 57.3 | 56.5 | 55.6 | 54.7 | 52.9 | 51 | 49.8 | 49.1 | 49.1 | 49 | 48.7 | 49.1 | 49.7 | 51 | 52.2 | 53.5 | 54.5 | 55.4 | 56.2 | 57.2 | 57.7 | 58.2 | 57 | 55.2 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 15.2 | 12 | 11.8 | 12 | 12 | 12 | 12.2 | 12 | 11.7 | 11.7 | 11.5 | 11.2 | 11.3 | 10.9 | 10.7 | 10.9 | 10.7 | 11.7 | 12.2 | 13.5 | 14 | 14.5 | 14.7 | 15 | 15.2 |
| Franklin | Preston | µg/m³ | 9 | 6.4 | 6.5 | 6.8 | 7.2 | 7.6 | 7.8 | 8.1 | 8.3 | 8.4 | 8.6 | 8.6 | 8.7 | 8.6 | 8.6 | 8.7 | 8.7 | 8.6 | 8.6 | 8.8 | 8.9 | 9 | 8.8 | 8.5 | 8.4 |
| Idaho | Cottonwood | µg/m³ | 23.8 | 11 | 11 | 11.2 | 11.2 | 11.2 | 11.4 | 11.2 | 11.1 | 10.7 | 10.8 | 10.5 | 10.4 | 10.1 | 10.2 | 13 | 15.4 | 17.3 | 18.5 | 19.7 | 20.6 | 21.5 | 22.3 | 22.9 | 23.8 |
| Idaho | Grangeville | µg/m³ | 18.2 | 17.1 | 17 | 17 | 17.2 | 17.4 | 17.4 | 17.1 | 17 | 16.6 | 16.6 | 16.3 | 16.6 | 16.6 | 16.5 | 16.7 | 16.8 | 16.7 | 17 | 17.4 | 17.7 | 17.9 | 17.9 | 17.9 | 18.2 |
| Kootenai | Coeur d'Alene | µg/m³ | 20.6 | 16.9 | 17.1 | 17.5 | 17.9 | 18.4 | 18.8 | 19.2 | 19.7 | 20 | 20.5 | 20.5 | 20.5 | 20.1 | 20.2 | 20.3 | 20.5 | 20.4 | 20.2 | 20.2 | 20.2 | 20.2 | 20.2 | 20.5 | 20.6 |
| Latah | Juliaetta | µg/m³ | 17.8 | 13 | 12.9 | 13.2 | 13.5 | 13.4 | 13.3 | 13.6 | 13.8 | 13.8 | 14 | 14.1 | 14.4 | 15 | 15.7 | 15.6 | 15.7 | 16.5 | 16.6 | 16.5 | 16.7 | 16.8 | 17 | 17.5 | 17.8 |
| Latah | Moscow | µg/m³ | 17.6 | 7.5 | 7.4 | 7.5 | 7.7 | 7.7 | 7.8 | 7.9 | 8.4 | 8.8 | 9.6 | 11 | 12.1 | 12.6 | 13.2 | 13.3 | 13.7 | 14.3 | 14.6 | 15.2 | 16.5 | 16.5 | 16.7 | 17.2 | 17.6 |
| Latah | Troy | µg/m³ | 14.7 | 6.7 | 6.9 | 6.8 | 7 | 7.1 | 7.3 | 7.7 | 8.3 | 8.9 | 9 | 9.7 | 10.1 | 10.6 | 11 | 11.4 | 11.6 | 12 | 12.1 | 12.6 | 13.1 | 13.1 | 13.5 | 14 | 14.7 |
| Lemhi | Salmon | µg/m³ | 15.5 | 12 | 12.6 | 12.9 | 13.1 | 13.3 | 13.9 | 14.2 | 14.6 | 15.3 | 15.2 | 15.4 | 15.5 | 15.4 | 15.1 | 15.2 | 15.2 | 15.3 | 15.3 | 15.2 | 15 | 15 | 14.6 | 14.4 | 13.7 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 15.3 | 11.2 | 11 | 11.2 | 11.1 | 11.5 | 11.7 | 11.7 | 11.7 | 11.8 | 11.4 | 11.2 | 10.9 | 10.4 | 10.4 | 10.7 | 10.8 | 11.7 | 11.9 | 12.4 | 12.7 | 13.6 | 14.1 | 14.7 | 15.3 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 16.5 | 15.3 | 15 | 15 | 15 | 14.7 | 14.6 | 14.3 | 14.8 | 14.9 | 15.1 | 15.5 | 15.7 | 15.5 | 15.4 | 15.6 | 16.2 | 16.5 | 16.5 | 16.2 | 15.2 | 14.9 | 14.5 | 15.3 | 15.3 |
| Madison | Rexburg | µg/m³ | 10.7 | 6.4 | 6.8 | 7.4 | 7.9 | 8.2 | 8.6 | 8.9 | 9.1 | 9.2 | 9.5 | 9.7 | 9.7 | 9.8 | 10 | 10.2 | 10.4 | 10.5 | 10.5 | 10.7 | 10.6 | 10.4 | 10.3 | 10.2 | 9.8 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 19.8 | 11.7 | 11.6 | 11.5 | 11.4 | 11.3 | 11.2 | 11.5 | 11.7 | 12.3 | 13 | 13.7 | 14.2 | 14.7 | 15 | 15.1 | 15.7 | 15.8 | 16.3 | 16.7 | 16.9 | 17.4 | 18.2 | 19.1 | 19.8 |
| Nez Perce | Lewiston | µg/m³ | 24.2 | 14.7 | 14.8 | 15 | 15.3 | 15.7 | 15.8 | 16 | 16.6 | 17.4 | 17.5 | 18.1 | 19 | 19.9 | 20.3 | 20.5 | 20.9 | 21.6 | 21.8 | 22.2 | 22.5 | 22.7 | 23.1 | 23.7 | 24.2 |
| Shoshone | Pinehurst | µg/m³ | 14.2 | 10.2 | 10.5 | 10.7 | 11.1 | 11.3 | 11.6 | 11.7 | 11.9 | 12.1 | 12.3 | 12.6 | 12.7 | 12.4 | 12.4 | 12.4 | 12.4 | 12.5 | 12.5 | 12.6 | 12.9 | 13.2 | 13.6 | 14 | 14.2 |
| Twin Falls | Twin Falls | µg/m³ | 18.5 | 16.6 | 16.5 | 16.2 | 16 | 15.8 | 15.8 | 15.6 | 15.1 | 15.2 | 15.2 | 15.8 | 16.2 | 16.8 | 17.2 | 17.2 | 17 | 16.7 | 16.8 | 17.1 | 17.4 | 17.2 | 17.5 | 17.9 | 18.5 |
| Valley | McCall | µg/m³ | 22.2 | 18.5 | 18.3 | 18.1 | 17.9 | 17.8 | 17.7 | 17.7 | 18 | 18.1 | 18.4 | 18.7 | 19.4 | 19.8 | 20.5 | 20.6 | 21.1 | 21.7 | 21.9 | 21.9 | 22.1 | 22.1 | 22.2 | 22.2 | 22.1 |
| Washington | Weiser | µg/m³ | 36.5 | 29.7 | 29.2 | 28.8 | 28.5 | 28.2 | 27.9 | 27.7 | 28 | 28.3 | 28.7 | 29.1 | 29.3 | 30.2 | 31.1 | 32.5 | 33.8 | 35.2 | 36.3 | 36.5 | 36.5 | 36.3 | 35.8 | 35.2 | 35 |

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