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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 | 115.7 | 87.6 | 90.3 | 92.6 | 95.1 | 97.8 | 100.3 | 103 | 105 | 109.5 | 113.7 | 114 | 115.2 | 115.7 | 114.2 | 113 | 111.7 | 109.7 | 106.9 | 104 | 101.2 | 98.6 | 95.9 | 93.2 | 91.1 |
| Bannock | Pocatello | µg/m³ | 63 | 17.4 | 19.1 | 20.6 | 22.2 | 24.1 | 26.4 | 28.7 | 30.8 | 34.4 | 38.1 | 41.7 | 45.2 | 48.7 | 52.1 | 56 | 59.3 | 61 | 62.2 | 62.7 | 63 | 61.7 | 60 | 59.1 | 58.2 |
| Benewah | St Maries PM2.5 | µg/m³ | 27.4 | 20.6 | 21.5 | 22.2 | 23.1 | 23.7 | 24.5 | 25.3 | 25.9 | 26.7 | 27.2 | 27.4 | 27.4 | 26.5 | 25.7 | 25.4 | 25.3 | 25.5 | 25.9 | 25.8 | 25.7 | 25.4 | 25.4 | 25.5 | 25.5 |
| Blaine | Ketchum | µg/m³ | 40.4 | 16.4 | 16.7 | 17 | 17.1 | 17.4 | 17.9 | 18.9 | 20 | 21.2 | 22.9 | 24.9 | 26.5 | 27.9 | 29 | 30.4 | 32 | 32.7 | 33.5 | 33.9 | 34.8 | 36.6 | 38.4 | 39.5 | 40.4 |
| Boise | Garden Valley | µg/m³ | 79.2 | 46.5 | 49.4 | 52.3 | 55.2 | 58.1 | 60.6 | 63.4 | 66.1 | 68.8 | 71.3 | 73.5 | 75.5 | 77.2 | 78.4 | 79.2 | 78.6 | 77.1 | 75.6 | 73.8 | 72.4 | 70.7 | 69.1 | 67.3 | 65.5 |
| Boise | Idaho City | µg/m³ | 68 | 45.6 | 47.9 | 49.9 | 51.9 | 54.1 | 56 | 57.9 | 59.8 | 61.7 | 63.2 | 64.8 | 67.1 | 67.7 | 68 | 67.7 | 67.9 | 67.5 | 66.9 | 65.7 | 64.7 | 63.3 | 62.3 | 61.3 | 60.7 |
| Bonner | Sandpoint | µg/m³ | 16 | 10.3 | 10.5 | 10.8 | 11 | 11.3 | 11.6 | 12.2 | 12.9 | 13.5 | 14.1 | 14.5 | 14.6 | 14.9 | 15.5 | 15.6 | 15.8 | 15.9 | 16 | 16 | 15.8 | 15.7 | 15.4 | 15.2 | 14.7 |
| Bonneville | Idaho Falls | µg/m³ | 71.2 | 9.2 | 10.6 | 12.8 | 15.3 | 17.7 | 20.8 | 24.4 | 27.7 | 31.6 | 35.2 | 39 | 42.2 | 45.6 | 48.8 | 52.4 | 56.1 | 60.4 | 64.6 | 67.6 | 70.6 | 71 | 71.2 | 71 | 69.7 |
| Boundary | Bonners Ferry | µg/m³ | 10.5 | 4.6 | 4.8 | 5.3 | 5.5 | 5.7 | 6.3 | 6.7 | 7.1 | 7.5 | 8 | 8.5 | 8.7 | 8.9 | 9.2 | 9.4 | 9.3 | 9.4 | 9.3 | 9.4 | 9.5 | 9.8 | 10.1 | 10.2 | 10.5 |
| Canyon | Nampa | µg/m³ | 144.4 | 121.2 | 125.6 | 130.6 | 136.5 | 139.9 | 141.2 | 142.7 | 144.4 | 144.2 | 141.2 | 140.7 | 139.7 | 139.2 | 137.9 | 136.7 | 135.7 | 133.7 | 131.4 | 129.4 | 127 | 124 | 120.7 | 118.5 | 116.6 |
| Franklin | Preston | µg/m³ | 16.2 | 3.7 | 4.2 | 4.6 | 4.9 | 5.1 | 5.5 | 6 | 6.6 | 7 | 7.3 | 7.7 | 7.8 | 8 | 8.1 | 8.5 | 9.7 | 11.2 | 11.8 | 12.3 | 13.1 | 14 | 14.9 | 15.7 | 16.2 |
| Idaho | Grangeville | µg/m³ | 40.3 | 31 | 31.4 | 32.1 | 33 | 33.5 | 34.3 | 34.5 | 35.6 | 36.4 | 37.2 | 37.8 | 38.2 | 39.2 | 39.8 | 40.3 | 40 | 39.8 | 39 | 37.9 | 36.9 | 35.7 | 34.7 | 33.7 | 32.9 |
| Kootenai | Coeur d'Alene | µg/m³ | 26.1 | 17.1 | 18.5 | 19.8 | 21.1 | 22.3 | 23.3 | 24.3 | 25.1 | 25.7 | 26 | 26.1 | 26.1 | 25.9 | 25.5 | 25.7 | 25.9 | 25.8 | 25.7 | 25.3 | 25.1 | 24.7 | 24.5 | 24 | 23.4 |
| Latah | Moscow | µg/m³ | 38.1 | 31.9 | 33.6 | 34.9 | 35.7 | 36.7 | 37.5 | 37.9 | 38.1 | 37.8 | 37.5 | 37.4 | 36.5 | 35.4 | 34.3 | 33.5 | 32.4 | 31.3 | 30.8 | 30 | 29.3 | 28.6 | 27.6 | 26.8 | 25.7 |
| Lemhi | Salmon | µg/m³ | 37 | 21.5 | 22 | 22.6 | 23.1 | 23.8 | 24.5 | 25.1 | 25.7 | 26.2 | 27.3 | 28.3 | 29.2 | 30.3 | 31.3 | 32.5 | 33.7 | 35 | 35.7 | 36.1 | 36.1 | 36.4 | 36.5 | 36.8 | 37 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 46.5 | 35.9 | 36.7 | 37.7 | 39 | 40.2 | 41.1 | 42 | 43 | 44.1 | 45.1 | 46 | 46.5 | 45.9 | 44.6 | 43.9 | 43.8 | 43.3 | 42.6 | 41.4 | 40.1 | 39.1 | 38.6 | 37.2 | 36.2 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 42.9 | 31.2 | 32.2 | 33.7 | 35 | 36.4 | 38 | 39.3 | 40.8 | 42.1 | 42.9 | 42.9 | 42.2 | 41.7 | 41.2 | 40.1 | 39 | 38.2 | 37.1 | 36.2 | 36.2 | 35.5 | 35.2 | 34.6 | 33.9 |
| Nez Perce | Lewiston | µg/m³ | 48 | 33.5 | 34.9 | 36.5 | 37.9 | 39.1 | 40.7 | 42 | 43.9 | 46 | 46.9 | 47.5 | 47.8 | 48 | 47 | 45.6 | 45 | 44.2 | 43.4 | 42.4 | 41.5 | 40.5 | 39.2 | 38.1 | 36.9 |
| Shoshone | Pinehurst | µg/m³ | 23.6 | 18.5 | 18.5 | 18.7 | 19.1 | 19.7 | 20.1 | 20.7 | 21.5 | 22.3 | 22.4 | 22.6 | 23 | 23.3 | 23 | 22.2 | 21.8 | 21.7 | 21.9 | 22.1 | 22.4 | 23 | 23.2 | 23.3 | 23.6 |
| Twin Falls | Twin Falls | µg/m³ | 121.7 | 77.2 | 81.5 | 85.8 | 89.8 | 93.8 | 97.2 | 100.9 | 105.3 | 111.7 | 115.3 | 116.6 | 117.5 | 118.1 | 118.3 | 119 | 119.6 | 120 | 119.5 | 120.4 | 120.6 | 121.4 | 121.7 | 121.1 | 120.3 |
| Valley | McCall | µg/m³ | 57.2 | 52.2 | 52.8 | 53.3 | 53.6 | 54 | 54.7 | 55.4 | 55.9 | 56.3 | 56.6 | 56.9 | 57.2 | 56.5 | 55.9 | 54.9 | 53.4 | 51.8 | 50.3 | 48 | 45.7 | 43.4 | 41.3 | 39.9 | 38.8 |
