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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 | 55.5 | 40.9 | 42.8 | 44.3 | 45.9 | 47.2 | 48.4 | 48.5 | 48.4 | 48.4 | 49 | 50.1 | 52.6 | 54.5 | 55.5 | 55.2 | 54.8 | 54.5 | 53.5 | 52.9 | 52.1 | 51.9 | 53.6 | 54.7 | 54.3 |
| Ada | Meridian | µg/m³ | 42 | 38.9 | 39.8 | 40.6 | 41.5 | 42 | 42 | 41.9 | 41.3 | 40.6 | 39.4 | 39.7 | 41 | 41.3 | 41.1 | 41.6 | 40.8 | 39.5 | 38.6 | 38.4 | 38.9 | 39.4 | 40.1 | 40.4 | 39.5 |
| Bannock | Pocatello | µg/m³ | 49.8 | 6.9 | 7 | 7.2 | 7.4 | 8.3 | 9.8 | 11.6 | 13.9 | 17.3 | 21.6 | 27.3 | 33.2 | 37.9 | 40.3 | 42.1 | 43.2 | 44 | 44.9 | 46.1 | 46.8 | 47.9 | 48.7 | 49.3 | 49.8 |
| Benewah | St Maries PM2.5 | µg/m³ | 30.2 | 11.7 | 12 | 12.1 | 11.8 | 11.4 | 11.1 | 10.7 | 10.1 | 9.6 | 9.6 | 10.5 | 11.9 | 13.4 | 14.8 | 16.5 | 17.7 | 18.4 | 19.6 | 21 | 22.8 | 24.7 | 26.7 | 28.4 | 30.2 |
| Blaine | Ketchum | µg/m³ | 20.9 | 12.6 | 13.7 | 14.6 | 15.3 | 16.4 | 17.3 | 18.2 | 19 | 19.8 | 20.4 | 20.7 | 20.8 | 20.9 | 20.8 | 20.6 | 20.3 | 20.1 | 19.8 | 19.5 | 19.1 | 18.1 | 16.9 | 15.4 | 13.8 |
| Boise | Garden Valley | µg/m³ | 55.9 | 29.8 | 30.8 | 32.1 | 33 | 34.1 | 35.1 | 36 | 37 | 38.1 | 39.4 | 41.4 | 44 | 44.6 | 45 | 45.1 | 45.7 | 46.4 | 47.6 | 48.8 | 50.5 | 52.5 | 54.1 | 55.3 | 55.9 |
| Boise | Idaho City | µg/m³ | 40.2 | 25.8 | 26.8 | 27.7 | 28.5 | 29.5 | 30.6 | 31.3 | 32 | 33.1 | 34.4 | 35.7 | 36.5 | 36.7 | 37 | 37.5 | 37.9 | 37.4 | 36.7 | 36.4 | 37.2 | 38 | 38.8 | 39.5 | 40.2 |
| Bonner | Sandpoint | µg/m³ | 68.6 | 27.2 | 31 | 34 | 36.7 | 39.7 | 42.4 | 44.2 | 44.7 | 45.3 | 46.2 | 47.2 | 48.8 | 50.8 | 53.6 | 55.5 | 55.4 | 55.4 | 56.6 | 58 | 60.1 | 62.5 | 65 | 67 | 68.6 |
| Bonneville | Idaho Falls | µg/m³ | 45.6 | 7.6 | 7.7 | 7.7 | 8.1 | 8.6 | 9.5 | 11 | 12.7 | 14.9 | 17.2 | 19.9 | 23.1 | 27.6 | 32 | 35.8 | 38.4 | 39.6 | 40.6 | 41.7 | 42.5 | 43.4 | 44.1 | 44.9 | 45.6 |
| Boundary | Bonners Ferry | µg/m³ | 71.7 | 11.5 | 15.7 | 20.7 | 25.3 | 30.3 | 34.4 | 37.8 | 41 | 43.1 | 44.2 | 45.9 | 47.4 | 49 | 50.5 | 52.3 | 54.3 | 56.5 | 58.9 | 61.8 | 64.9 | 68 | 70.5 | 71.4 | 71.7 |
| Boundary | Mt Hall | µg/m³ | 64.9 | 26.5 | 30.2 | 31.7 | 32.3 | 32.9 | 34.6 | 37.9 | 40.3 | 42.3 | 43.9 | 44.9 | 46.4 | 47.6 | 48.8 | 50.4 | 52.5 | 54.2 | 56.4 | 59.3 | 62.5 | 64.9 | 59.8 | 55.9 | 55 |
| Boundary | Porthill | µg/m³ | 45 | 35 | 36.3 | 36.6 | 36.5 | 36.2 | 35.7 | 35.3 | 37.4 | 39.4 | 40.9 | 41.7 | 42.6 | 43.5 | 44.2 | 44.1 | 44.2 | 44.4 | 44.6 | 44.7 | 45 | 39.9 | 35.8 | 31.8 | 28.4 |
| Canyon | Nampa | µg/m³ | 41.6 | 39.8 | 40 | 40.4 | 40.9 | 41 | 41.4 | 41.6 | 41.5 | 40.7 | 40 | 39.3 | 38.6 | 37.3 | 36.3 | 36 | 35 | 34.2 | 33.4 | 33.4 | 33.4 | 34.1 | 34.1 | 33.3 | 32.6 |
| Clearwater | Orofino - Nez Perce Tribe | µg/m³ | 26.5 | 26.5 | 25.2 | 24 | 22.8 | 21.4 | 20.1 | 19.2 | 18 | 17 | 16.2 | 15.2 | 14.2 | 12.9 | 11.7 | 11 | 9.5 | 8.7 | 7.2 | 6.6 | 6.5 | 6 | 5.1 | 4.7 | 5 |
| Franklin | Preston | µg/m³ | 18.9 | 8.5 | 8.7 | 8.7 | 8.7 | 8.7 | 8.8 | 8.7 | 8.9 | 8.9 | 8.8 | 8.9 | 9.2 | 9.9 | 10.7 | 11.2 | 12 | 12.5 | 14.2 | 15.3 | 15.9 | 16.7 | 17.6 | 18.4 | 18.9 |
| Idaho | Cottonwood | µg/m³ | 21.5 | 21.5 | 20.9 | 20.2 | 19.5 | 18.9 | 18.2 | 17.3 | 16.5 | 15.7 | 14.9 | 14.2 | 13.5 | 12.7 | 12 | 10.9 | 9.6 | 8.7 | 7.3 | 6.6 | 6.1 | 5 | 4 | 3.4 | 3.2 |
| Idaho | Grangeville | µg/m³ | 24.7 | 24.7 | 23.9 | 22.9 | 22 | 21 | 20.2 | 19.5 | 18.8 | 18.2 | 17.4 | 16.6 | 15.6 | 14.4 | 13.5 | 12.8 | 12.3 | 10.8 | 9.7 | 8.3 | 7.8 | 7.4 | 6.8 | 5.9 | 5.4 |
| Kootenai | Coeur d'Alene | µg/m³ | 69.5 | 16.2 | 18.2 | 19 | 19.3 | 19.2 | 18.7 | 18.2 | 17.7 | 18 | 18.7 | 19 | 19.6 | 21.2 | 24 | 27.8 | 31.7 | 35.9 | 40.5 | 46.3 | 52.6 | 58.7 | 64.1 | 68.2 | 69.5 |
| Latah | Juliaetta | µg/m³ | 23.3 | 23.3 | 22.8 | 22.6 | 21.7 | 21.4 | 20.6 | 19.8 | 19.1 | 18.2 | 17.1 | 15.8 | 15.3 | 14.6 | 13.3 | 11.6 | 11 | 9.3 | 8.8 | 8.5 | 7 | 6 | 6 | 6.6 | 7.6 |
| Latah | Troy | µg/m³ | 17.1 | 17.1 | 16.1 | 15.2 | 14.8 | 14.2 | 13.8 | 13.3 | 13.2 | 13 | 12.6 | 12.1 | 12 | 12 | 12.2 | 11.2 | 10.5 | 9.8 | 9.5 | 9.5 | 8 | 7.2 | 8 | 9.6 | 11.1 |
| Lemhi | Salmon | µg/m³ | 24.8 | 11.3 | 12.3 | 13.4 | 14.3 | 15.1 | 15.8 | 16.9 | 17.7 | 18.6 | 19.3 | 20.2 | 20.9 | 21.5 | 22.2 | 23 | 23.4 | 23.8 | 24.2 | 24.7 | 24.8 | 24.8 | 24.7 | 24 | 23.2 |
| Lewis | Reubens - Nez Perce Tribe | µg/m³ | 22.4 | 22.4 | 21.8 | 20.7 | 20.5 | 19.7 | 19.2 | 18.5 | 17.7 | 17 | 16.2 | 15.3 | 14 | 12.9 | 11.8 | 10.5 | 9.2 | 8.3 | 7.5 | 7.3 | 6.2 | 5 | 4.5 | 4.4 | 4.2 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 27.2 | 27.2 | 26.1 | 24.9 | 23.9 | 22.7 | 21.5 | 20.3 | 19.2 | 18.2 | 16.9 | 15.5 | 14.9 | 13.7 | 13 | 11.9 | 10.7 | 9.1 | 8.6 | 7.2 | 6.9 | 5.4 | 4.2 | 4 | 3.7 |
| Madison | Rexburg | µg/m³ | 36.1 | 6.4 | 6.8 | 6.9 | 6.8 | 7.2 | 7.3 | 7.8 | 8.6 | 10.2 | 11.8 | 13.8 | 16 | 18.5 | 21.1 | 24.4 | 27.1 | 28.8 | 30.2 | 31.4 | 32.3 | 33.3 | 34.1 | 35.2 | 36.1 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 27.4 | 27.4 | 26.5 | 25.5 | 24.7 | 24.2 | 23.3 | 23 | 22.2 | 21 | 20.1 | 18.3 | 16.2 | 14.8 | 13.7 | 12 | 11.5 | 9.5 | 8.7 | 7.9 | 6.2 | 5.1 | 4.4 | 4.3 | 4 |
| Nez Perce | Lewiston | µg/m³ | 26.1 | 26.1 | 25.3 | 24.6 | 24 | 23.2 | 22.5 | 21.7 | 20.7 | 19.5 | 18.5 | 16.7 | 15 | 13.6 | 12.3 | 11.1 | 10.2 | 9 | 8.7 | 7.7 | 6.4 | 5.6 | 5 | 4.9 | 4.7 |
| Shoshone | Pinehurst | µg/m³ | 38.4 | 11.1 | 10.8 | 10.5 | 9.9 | 10.5 | 11 | 11.4 | 11.1 | 11.2 | 11.6 | 12.4 | 13.7 | 15.2 | 17.2 | 18.6 | 20.5 | 22.4 | 24 | 26.1 | 28.2 | 30.4 | 32.8 | 35.7 | 38.4 |
| Twin Falls | Twin Falls | µg/m³ | 53.1 | 16.4 | 17.8 | 19.3 | 21.4 | 23.9 | 27 | 32.6 | 39 | 41.9 | 43.5 | 44.8 | 45.9 | 46.1 | 46.5 | 48 | 48.7 | 49.8 | 50.9 | 51.5 | 51.8 | 52.6 | 53 | 53.1 | 52.2 |
| Valley | McCall | µg/m³ | 29.4 | 21 | 21.5 | 22 | 22.4 | 22.5 | 22.7 | 22.9 | 23.1 | 23.3 | 23.3 | 23.6 | 24.2 | 25 | 26.2 | 27.4 | 28.1 | 28.6 | 29.4 | 29.4 | 29.2 | 28.2 | 27.7 | 26.9 | 26.1 |
| Washington | Weiser | µg/m³ | 43.5 | 29.1 | 29.4 | 28.8 | 29.1 | 29.3 | 29.9 | 31.5 | 31.7 | 32.2 | 34.5 | 36.9 | 38.6 | 39.2 | 39.4 | 39.8 | 40.3 | 40.3 | 40.3 | 40.4 | 40.3 | 40 | 40.5 | 41.9 | 43.5 |

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