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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 | 8.6 | 7 | 6.8 | 6.7 | 6.7 | 6.8 | 6.9 | 6.9 | 7.3 | 7.4 | 7.6 | 7.7 | 7.8 | 7.9 | 7.9 | 7.9 | 7.9 | 8.1 | 8.2 | 8.2 | 8.4 | 8.5 | 8.5 | 8.5 | 8.6 |
| Bannock | Pocatello | µg/m³ | 8.4 | 6.4 | 6.4 | 6.5 | 6.6 | 6.7 | 6.9 | 6.9 | 6.9 | 7.1 | 7.4 | 7.5 | 7.5 | 7.4 | 7.5 | 7.5 | 7.5 | 7.7 | 7.8 | 8 | 8 | 8.1 | 8.2 | 8.2 | 8.4 |
| Benewah | St Maries PM2.5 | µg/m³ | 28.3 | 5.1 | 5 | 5.8 | 9.2 | 13.6 | 17.1 | 19.4 | 20.9 | 21.5 | 21.9 | 22 | 22.3 | 22.7 | 23 | 23.2 | 23.7 | 24.4 | 25 | 25.5 | 26.2 | 27 | 27.7 | 27.9 | 28.3 |
| Blaine | Ketchum | µg/m³ | 3 | 3 | 3 | 3 | 3 | 3 | 2.9 | 2.9 | 2.9 | 2.9 | 2.6 | 2.7 | 2.6 | 2.6 | 2.5 | 2.7 | 2.8 | 2.4 | 2.6 | 2.8 | 2.6 | 2.6 | 2.7 | 2.7 | 2.8 |
| Boise | Garden Valley | µg/m³ | 6.4 | 5.3 | 5.4 | 5.5 | 5.5 | 5.7 | 5.6 | 5.7 | 5.9 | 5.6 | 5.7 | 5.8 | 5.7 | 5.6 | 5.5 | 5.6 | 5.6 | 5.7 | 5.5 | 5.6 | 5.7 | 5.8 | 6 | 6.1 | 6.4 |
| Boise | Idaho City | µg/m³ | 6.7 | 3.8 | 3.9 | 4 | 3.8 | 3.7 | 3.8 | 4 | 4.1 | 4.1 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.6 | 5.1 | 5.3 | 5.2 | 5.2 | 5.6 | 6 | 6.3 | 6.7 |
| Bonner | Sandpoint | µg/m³ | 52.2 | 27.9 | 27 | 25.6 | 20.2 | 18.5 | 18.1 | 19.1 | 24.3 | 29 | 33.7 | 33.8 | 33.3 | 32.4 | 31.5 | 32.1 | 33.7 | 36.2 | 38.8 | 41.5 | 43.7 | 46 | 48 | 50.3 | 52.2 |
| Boundary | Bonners Ferry | µg/m³ | 36 | 36 | 35.9 | 35 | 34.3 | 34.1 | 33.6 | 33.3 | 33.4 | 32.2 | 28.1 | 26.3 | 25.6 | 24.5 | 22.8 | 21.7 | 18.7 | 15.8 | 14.4 | 14.2 | 15.2 | 17.5 | 19.9 | 22.3 | 24.4 |
| Canyon | Nampa | µg/m³ | 9.6 | 7.3 | 7.3 | 7.3 | 7.2 | 7.4 | 7.4 | 7.8 | 8.4 | 8.6 | 8.9 | 9.3 | 9.3 | 9.4 | 9.2 | 9.2 | 9.1 | 9.1 | 9.1 | 9.2 | 9.2 | 9.3 | 9.2 | 9.4 | 9.6 |
| Franklin | Preston | µg/m³ | 6.1 | 4.7 | 4.7 | 4.8 | 4.9 | 5 | 5.2 | 5.4 | 5.5 | 5.6 | 5.7 | 5.8 | 6 | 5.9 | 5.9 | 5.8 | 5.7 | 5.7 | 5.7 | 5.6 | 5.5 | 5.5 | 5.7 | 6 | 6.1 |
| Idaho | Grangeville | µg/m³ | 20.6 | 6.3 | 6.6 | 7.1 | 7.7 | 8.4 | 9.6 | 10.6 | 11.9 | 13 | 13.9 | 14.3 | 14.6 | 15.2 | 15.7 | 16.2 | 16.5 | 17.5 | 18.2 | 18.7 | 19.2 | 20 | 20.3 | 20.6 | 20.5 |
| Kootenai | Coeur d'Alene | µg/m³ | 98.8 | 26.5 | 34.3 | 41.2 | 47.1 | 54.7 | 60.9 | 67.5 | 73.8 | 78.7 | 81.6 | 82.7 | 87.5 | 89.4 | 91.2 | 93.5 | 93.8 | 94.8 | 95.7 | 96.7 | 97.7 | 98.8 | |||
| Latah | Moscow | µg/m³ | 36.3 | 13.1 | 17.3 | 19.3 | 20.3 | 20.9 | 21 | 21.2 | 21.2 | 21.5 | 21.4 | 21.4 | 21.9 | 22.1 | 22.5 | 22.5 | 22.9 | 23.1 | 23.5 | 24.6 | 26.5 | 28.7 | 32.4 | 35.4 | 36.3 |
| Lemhi | Salmon | µg/m³ | 5.2 | 5.2 | 5.2 | 5.1 | 5.2 | 5.1 | 5 | 5.2 | 5.1 | 5 | 5 | 4.7 | 4.4 | 4.2 | 4 | 3.8 | 3.9 | 3.9 | 3.9 | 3.9 | 3.7 | 3.5 | 3.6 | 3.7 | 3.8 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 25.9 | 5.5 | 5.9 | 6.4 | 6.8 | 8 | 8.6 | 9.9 | 11 | 12.4 | 13.8 | 15.2 | 16.6 | 17.6 | 19.2 | 20.7 | 21.7 | 22.4 | 22.7 | 23.4 | 23.9 | 24.8 | 25.4 | 25.5 | 25.9 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 22.7 | 6.6 | 6.9 | 9.2 | 12 | 14.4 | 16.3 | 17.2 | 17.6 | 18 | 18.4 | 19 | 19.7 | 20.1 | 20.4 | 20.7 | 21.5 | 21.6 | 21.9 | 22.1 | 22.3 | 22.5 | 22.5 | 22.6 | 22.7 |
| Nez Perce | Lewiston | µg/m³ | 23.9 | 9.5 | 11.8 | 13.9 | 16 | 17.4 | 18.4 | 19.3 | 19.9 | 20.1 | 20.5 | 20.8 | 21.5 | 22.1 | 22.4 | 22.4 | 22.7 | 23 | 23 | 23 | 23 | 23 | 23 | 23.5 | 23.9 |
| Shoshone | Pinehurst | µg/m³ | 28.4 | 2.7 | 2.8 | 3 | 3.2 | 4.6 | 8.7 | 13.4 | 16.2 | 17.3 | 18.4 | 19.6 | 20.5 | 21.2 | 22 | 22.7 | 23.4 | 24 | 24.7 | 25.2 | 25.7 | 26 | 26.9 | 27.6 | 28.4 |
| Twin Falls | Twin Falls | µg/m³ | 6.3 | 5.2 | 5.3 | 5.6 | 6.3 | 6.1 | 5.9 | 5.7 | 5.5 | 5.2 | 5 | 4.8 | 4.8 | 5.1 | 5.1 | 5.2 | 5.1 | 5.1 | 5.1 | 5.2 | 5.5 | 5.7 | 5.6 | 5.5 | 5.3 |
| Valley | McCall | µg/m³ | 5.4 | 5 | 5.1 | 5 | 5.1 | 5.2 | 5.3 | 5.3 | 5.2 | 5.2 | 5.3 | 5 | 4.7 | 4.7 | 4.5 | 4.7 | 5 | 4.9 | 5 | 4.9 | 4.8 | 4.7 | 5 | 5.3 | 5.4 |
