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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 | Garden City | µg/m³ | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5.8 | 5.5 | 5.5 | 5.6 | 5.7 | 5.7 | 5.7 | 5.5 | 5.5 | 5.2 | 4.9 | 4.7 | 4.7 | 4.5 | 4.3 | 4.2 | 4.1 | 4 |
| Bannock | Pocatello | µg/m³ | 8.7 | 7.9 | 8 | 8.3 | 8.5 | 8.5 | 8.4 | 8.4 | 8.5 | 8.7 | 8.6 | 8.4 | 8.2 | 7.9 | 7.7 | 7.7 | 7.5 | 7.5 | 7.4 | 7.2 | 7 | 6.9 | 6.9 | 6.8 | 6.9 |
| Blaine | Ketchum | µg/m³ | 5.8 | 3.8 | 3.9 | 4 | 4 | 4.1 | 4.1 | 4.2 | 4.3 | 4.2 | 4.3 | 4.5 | 4.9 | 4.8 | 4.9 | 5 | 5.1 | 5 | 4.8 | 5.3 | 5.7 | 5.7 | 5.7 | 5.7 | 5.8 |
| Boise | Garden Valley | µg/m³ | 8.5 | 8.2 | 8.2 | 8.5 | 8.5 | 8.4 | 8.2 | 8 | 7.8 | 7.5 | 7.5 | 7.5 | 7.4 | 7.3 | 7 | 7 | 7 | 6.7 | 5.9 | 5.5 | 5.3 | 5.2 | 5.2 | 5.3 | 5.4 |
| Boise | Idaho City | µg/m³ | 5.1 | 5.1 | 5 | 4.9 | 4.8 | 4.9 | 4.7 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.5 | 4.6 | 4.7 | 4.6 | 4.6 | 4.6 | 4.4 | 4.2 | 4.3 | 4.4 | 4.2 | 4.6 | 4.6 |
| Bonner | Sandpoint | µg/m³ | 3.4 | 2.6 | 2.7 | 2.7 | 3 | 3.1 | 3.1 | 3 | 3 | 3.1 | 3.2 | 3.1 | 3 | 2.9 | 2.9 | 2.7 | 2.6 | 2.5 | 2.4 | 2.4 | 2.5 | 2.8 | 3 | 3.3 | 3.4 |
| Bonneville | Idaho Falls | µg/m³ | 4.8 | 4.6 | 4.5 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.4 | 4.5 | 4.5 | 4.6 | 4.5 | 4.5 | 4.5 | 4.6 | 4.6 | 4.6 | 4.7 | 4.6 | 4.7 | 4.7 | 4.7 | 4.8 | 4.8 |
| Boundary | Bonners Ferry | µg/m³ | 2.9 | 2.6 | 2.8 | 2.8 | 2.9 | 2.7 | 2.7 | 2.7 | 2.8 | 2.8 | 2.4 | 2.4 | 2 | 2 | 1.8 | 1.6 | 1.7 | 1.4 | 1.6 | 1.7 | 1.8 | 1.7 | 1.7 | 1.7 | 1.6 |
| Boundary | Mt Hall | µg/m³ | 1.7 | 1.7 | 1.7 | 1.7 | 1.5 | 1.6 | 1.6 | 1.5 | 1.6 | 1.5 | 1.6 | 1.5 | 1.5 | 1.7 | 1.6 | 1.3 | 1.5 | 1.5 | 1.3 | 1.2 | 1.2 | 1.1 | 1.1 | 1 | 1.2 |
| Boundary | Porthill | µg/m³ | 2.6 | 2.4 | 2.3 | 2.1 | 2.2 | 2.3 | 2.4 | 2.6 | 2.1 | 2 | 1.9 | 2.2 | 2.1 | 2 | 1.8 | 1.5 | 1.8 | 1.5 | 1.4 | 1.3 | 1.1 | 0.8 | 0.5 | 0.3 | 0.1 |
| Canyon | Nampa | µg/m³ | 7.4 | 7 | 7 | 7.2 | 7.3 | 7.4 | 7.2 | 7 | 7 | 7.2 | 7 | 7 | 6.9 | 6.6 | 6.3 | 6.1 | 6 | 6 | 6 | 5.9 | 5.8 | 5.7 | 5.3 | 5.1 | 4.9 |
| Caribou | Soda Springs | µg/m³ | 5.2 | 4.7 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.2 | 5.1 | 5.1 |
| Franklin | Preston | µg/m³ | 2.5 | 1.5 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.8 | 1.7 | 1.8 | 1.9 | 1.9 | 1.9 | 2 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 2.2 | 2.3 | 2.5 |
| Idaho | Grangeville | µg/m³ | 2.7 | 2.7 | 2.6 | 2.5 | 2.6 | 2.5 | 2.3 | 2.2 | 2.3 | 2.4 | 2.4 | 2.5 | 2.5 | 2.1 | 2.1 | 2.2 | 2.1 | 2.1 | 2 | 2.2 | 2.1 | 2 | 1.9 | 1.8 | 1.7 |
| Kootenai | Coeur d'Alene | µg/m³ | 4.3 | 1.9 | 1.9 | 2 | 2.2 | 2.2 | 2.4 | 2.9 | 3.2 | 3.3 | 3.2 | 3.1 | 3.1 | 3 | 2.9 | 3 | 2.9 | 2.9 | 3 | 3 | 3 | 3.2 | 3.4 | 3.8 | 4.3 |
| Latah | Juliaetta | µg/m³ | 5.1 | 4.9 | 4.9 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 4.9 | 5 | 5 | 4.7 | 4.8 | 4.7 | 4.8 | 4.7 | 4.8 | 4.3 | 3.6 | 3.2 | 3 | 2.9 | 2.6 | 2.7 | 2.7 |
| Latah | Moscow | µg/m³ | 7.1 | 7 | 6.9 | 7 | 7.1 | 7 | 6.9 | 6.8 | 6.8 | 6.8 | 6.7 | 6.6 | 6.7 | 6.7 | 6.8 | 6.8 | 6.9 | 6.8 | 6.7 | 6.5 | 6.2 | 6 | 5.9 | 5.8 | 5.8 |
| Latah | Potlatch | µg/m³ | 4 | 4 | 3.9 | 3.6 | 3.5 | 3.3 | 3.2 | 3.2 | 3.4 | 3.1 | 3.2 | 3 | 3.1 | 2.8 | 2.8 | 2.7 | 2.8 | 2.6 | 2.7 | 2.8 | 2.4 | 2.4 | 2.5 | 2.6 | 3.1 |
| Lewis/Idaho | Kamiah - Nez Perce Tribe | µg/m³ | 6.9 | 5.3 | 5.5 | 5.8 | 6.1 | 6.2 | 6.1 | 6.5 | 6.6 | 6.7 | 6.9 | 6.7 | 6.2 | 6.1 | 6 | 5.5 | 5.2 | 4.9 | 4.7 | 4.6 | 4.5 | 4.1 | 3.8 | 3.6 | 3.2 |
| Madison | Rexburg | µg/m³ | 7.2 | 7 | 7 | 7 | 7.1 | 7.1 | 7.1 | 7.1 | 7.1 | 7.1 | 7.1 | 7.1 | 7.1 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 |
| Nez Perce | Lapwai - Nez Perce Tribe | µg/m³ | 4.1 | 4 | 4 | 4.1 | 4.1 | 3.7 | 3.5 | 3.5 | 3.5 | 3.6 | 3.4 | 3.2 | 3.2 | 3.2 | 3.2 | 3.5 | 3.7 | 3.6 | 2.8 | 2.5 | 2.5 | 2.4 | 2 | 2 | 2.4 |
| Nez Perce | Lewiston | µg/m³ | 7.1 | 6.8 | 7 | 7.1 | 6.9 | 6.7 | 6.7 | 6.6 | 6.7 | 6.4 | 5.9 | 5.4 | 5 | 5 | 5.3 | 5.5 | 5.5 | 5.2 | 5 | 4.9 | 4.8 | 4.7 | 4.9 | 4.8 | 4.8 |
| Shoshone | Pinehurst | µg/m³ | 8.6 | 5.7 | 6 | 6.1 | 6.1 | 6.2 | 6.3 | 6.4 | 6.4 | 6.4 | 6.6 | 6.7 | 6.7 | 6.8 | 6.8 | 6.7 | 6.9 | 7 | 7 | 7 | 7.6 | 8.3 | 8.6 | 8.5 | 8.4 |
| Twin Falls | Twin Falls | µg/m³ | 6.5 | 6.3 | 6.4 | 6.4 | 6.5 | 6.4 | 6.4 | 6.4 | 6.2 | 6.1 | 6.1 | 6.1 | 6 | 6 | 5.9 | 5.7 | 5.7 | 5.6 | 5.6 | 5.5 | 5.2 | 4.9 | 4.7 | 4.5 | 4.2 |
| Washington | Weiser | µg/m³ | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7.8 | 7.7 | 7.6 | 7.6 | 7.6 | 7.6 | 7.6 | 7.6 | 7.5 | 7.5 | 7.4 | 7.4 | 7.4 |
