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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 | 34.2 | 34.2 | 32.8 | 31.5 | 30.5 | 29.6 | 28.7 | 27.8 | 27.5 | 28.5 | 29.9 | 30.2 | 31.2 | 32 | 32.7 | 33.4 | 33.3 | 33 | 32.4 | 31.5 | 31.1 | 30.7 | 30.3 | 29.9 | 29.4 |
| Bannock | Pocatello | µg/m³ | 8.7 | 6.9 | 6.9 | 6.9 | 7 | 7.1 | 7.1 | 7.2 | 7.2 | 7.2 | 7.1 | 7.1 | 7.3 | 7.6 | 7.7 | 8 | 8.1 | 8.6 | 8.4 | 8.5 | 8.6 | 8.6 | 8.7 | 8.7 | 8.7 |
| Benewah | St Maries PM2.5 | µg/m³ | 25.5 | 24.9 | 24.9 | 24.9 | 24.9 | 24.8 | 24.6 | 24.8 | 24.9 | 24.7 | 24.8 | 25.2 | 25.5 | 25.2 | 25 | 24.6 | 24.3 | 24.1 | 24 | 24 | 23.7 | 23.4 | 23.2 | 22.9 | 22.7 |
| Blaine | Ketchum | µg/m³ | 8 | 8 | 7.7 | 7.4 | 7 | 6.8 | 6.6 | 6.7 | 6.5 | 6.5 | 6.6 | 6.6 | 6.8 | 7 | 7 | 7 | 6.7 | 6.5 | 6.6 | 6.6 | 6.4 | 6.1 | 6 | 6.1 | 6.2 |
| Boise | Garden Valley | µg/m³ | 33.7 | 33.7 | 32.7 | 31.8 | 30.6 | 29.8 | 28.8 | 27.7 | 26.9 | 26 | 25.9 | 25 | 24.3 | 23.5 | 22.8 | 22.3 | 21.7 | 21.2 | 20.5 | 20 | 19.5 | 18.5 | 18.1 | 17.5 | 17 |
| Boise | Idaho City | µg/m³ | 27.2 | 27.2 | 25.8 | 24.5 | 23.1 | 21.9 | 20.9 | 19.8 | 18.9 | 18 | 17.4 | 16.7 | 16.5 | 16.2 | 16.3 | 16 | 15.7 | 15.7 | 15.6 | 15.6 | 15.4 | 15.4 | 15 | 14.7 | 14.5 |
| Bonner | Sandpoint | µg/m³ | 25.5 | 20.7 | 21.1 | 21.5 | 22.2 | 22.9 | 23.4 | 23.8 | 24.2 | 24.6 | 25 | 25.4 | 25.5 | 25.4 | 25.1 | 24.9 | 24.5 | 24.2 | 23.6 | 22.6 | 21.6 | 20.6 | 19.5 | 18.8 | 18 |
| Bonneville | Idaho Falls | µg/m³ | 9.7 | 7.1 | 7.3 | 7.3 | 7.2 | 7.4 | 7.5 | 7.6 | 7.6 | 7.8 | 8 | 8.3 | 8.5 | 8.7 | 8.9 | 8.9 | 9 | 8.9 | 8.9 | 8.9 | 9.3 | 9.5 | 9.5 | 9.7 | 9.6 |
| Boundary | Bonners Ferry | µg/m³ | 26.8 | 21.4 | 21.9 | 22.4 | 22.9 | 23.4 | 24.1 | 24.7 | 25.1 | 25.5 | 25.9 | 26.3 | 26.4 | 26.8 | 26.7 | 26.6 | 26.3 | 25.9 | 24.9 | 24 | 22.9 | 21.9 | 21.1 | 20 | 18.9 |
| Canyon | Nampa | µg/m³ | 73.2 | 56.4 | 55.8 | 55.5 | 55.9 | 57.1 | 58.4 | 59 | 59.7 | 62 | 65.9 | 69 | 70.7 | 71.9 | 72.5 | 73 | 73.2 | 72.6 | 71.7 | 70.9 | 69.7 | 68.9 | 67.5 | 66.2 | 64.9 |
| Franklin | Preston | µg/m³ | 8.1 | 7.4 | 7.3 | 7.3 | 7.5 | 7.6 | 7.6 | 7.7 | 7.8 | 7.6 | 7.6 | 7.7 | 7.8 | 8 | 7.6 | 7.6 | 7 | 6.9 | 7 | 7 | 7.2 | 7.6 | 7.6 | 8 | 8.1 |
| Idaho | Grangeville | µg/m³ | 27.9 | 23 | 23 | 23.2 | 23.3 | 23.4 | 23.7 | 24.1 | 24.9 | 25.3 | 25.9 | 26.4 | 26.8 | 26.9 | 27.2 | 27.3 | 27.3 | 27.5 | 27.6 | 27.9 | 27.8 | 27.3 | 27.1 | 27 | 26.8 |
| Kootenai | Coeur d'Alene | µg/m³ | 23.4 | 22.2 | 22.4 | 22.6 | 22.6 | 22.7 | 22.9 | 22.9 | 23 | 23.4 | 23.3 | 23.2 | 23.1 | 22.7 | 22 | 21.1 | 20.2 | 19.6 | 19.1 | 18.2 | 17.6 | 16.7 | 16.2 | ||
| Latah | Moscow | µg/m³ | 24.5 | 23.3 | 23.5 | 23.4 | 23.6 | 23.9 | 24.2 | 24.4 | 24.4 | 24.5 | 24.4 | 23.8 | 23.3 | 23 | 22.8 | 22.1 | 21.6 | 21.3 | 20.9 | 20.7 | 20.2 | 19.8 | 19.3 | 18.9 | 18.6 |
| Lemhi | Salmon | µg/m³ | 16.3 | 14.1 | 14.2 | 14.1 | 14.4 | 14.7 | 15 | 15.2 | 15.3 | 15.4 | 15.7 | 15.7 | 16.1 | 16.2 | 16.3 | 16 | 15.2 | 14.3 | 13.5 | 12.7 | 12.3 | 11.9 | 11.6 | 11.5 | 11.2 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 27.7 | 22.7 | 22.9 | 23 | 23.2 | 23.2 | 23.5 | 23.7 | 24 | 24.3 | 24.4 | 24.7 | 25 | 25.7 | 25.8 | 26.2 | 26.7 | 26.6 | 26.8 | 27.4 | 27.7 | 26.4 | 26.3 | 26.7 | 27 |
| Madison | Rexburg | µg/m³ | 10.2 | 8.8 | 8.8 | 8.9 | 9 | 9.2 | 9.2 | 9.6 | 9.5 | 9.7 | 9.8 | 10 | 10 | 10.1 | 10.2 | 10 | 9.6 | 9.4 | 9.2 | 9.3 | 9.1 | 9.1 | 9.4 | 9.5 | 9.6 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 29.4 | 25.5 | 25.7 | 26.1 | 26.7 | 27.2 | 27.6 | 28 | 28.4 | 28.8 | 29.3 | 29.3 | 29.4 | 29.2 | 29.2 | 29.2 | 29.4 | 29.2 | 29.2 | 28.7 | 28.3 | 28.1 | 28 | 27.9 | 27.7 |
| Nez Perce | Lewiston | µg/m³ | 36.5 | 31.1 | 32.2 | 32.8 | 33.5 | 34 | 34.4 | 34.4 | 35 | 35.4 | 35.9 | 36.5 | 36 | 36 | 35.8 | 35.4 | 35.2 | 35 | 34.7 | 34.5 | 33.9 | 33.1 | 32.3 | 31.7 | 30.5 |
| Shoshone | Pinehurst | µg/m³ | 24.9 | 24.9 | 24.8 | 24.7 | 24.9 | 24.9 | 24.8 | 24.4 | 24.4 | 24.1 | 24.6 | 24.4 | 24.2 | 23.9 | 23.4 | 22.8 | 22 | 21.4 | 20.4 | 19.5 | 18.7 | 18 | 17.2 | 16.5 | 15.7 |
| Twin Falls | Twin Falls | µg/m³ | 13.6 | 8.3 | 8.6 | 9.2 | 9.6 | 10 | 10.2 | 10.3 | 10.7 | 11 | 11.2 | 11.8 | 12.5 | 13.1 | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 | 13.5 | 13.5 | 13.5 | 13.6 | 13.5 |
| Valley | McCall | µg/m³ | 26.3 | 26.3 | 26.1 | 26.2 | 26.2 | 26.2 | 26 | 25.8 | 25.8 | 25.6 | 25.5 | 25.2 | 24.8 | 24.7 | 24.1 | 23.6 | 22.9 | 22.2 | 21.4 | 20.7 | 19.9 | 19.3 | 18.7 | 18.5 | 17.8 |
