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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cascades | Multorpor | µg/m³ | 4.8 | 4.5 | 4.6 | 4.7 | 4.8 | 4.8 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.5 | 4.5 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | |||
| Central Oregon | Bend NE 8th & Emerson Sensors | µg/m³ | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 | 4 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | |||
| Central Oregon | Bend Pump Station | µg/m³ | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4 | 4 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.6 | |||
| Central Oregon | Burns Washington Street | µg/m³ | 3 | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 3 | 3 | 3 | 3 | 2.9 | 2.9 | 3 | 2.9 | 2.9 | 2.9 | 2.9 | 2.8 | 2.8 | 2.8 | 2.8 | 2.7 | |||
| Central Oregon | Chiloquin Duke Drive | µg/m³ | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.2 | 3.2 | 3.1 | 3.1 | 3 | 3 | 3 | 3 | 3 | 2.9 | 2.9 | 2.9 | 2.9 | 2.8 | |||
| Central Oregon | John Day Dayton Street | µg/m³ | 4.2 | 3.8 | 3.8 | 3.9 | 3.9 | 4 | 4.1 | 4.1 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 | 4 | 4 | 3.9 | 3.9 | |||
| Central Oregon | La Pine Rural Fire Dept 103 | µg/m³ | 4.8 | 4.7 | 4.7 | 4.7 | 4.8 | 4.8 | 4.7 | 4.7 | 4.7 | 4.6 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.2 | |||
| Central Oregon | Madras Westside Elementary | µg/m³ | 5.4 | 5.4 | 5.3 | 5.2 | 5.2 | 5.1 | 5 | 4.8 | 4.4 | 4.2 | 4.1 | 4 | 3.9 | 3.8 | 3.8 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.5 | 3.5 | |||
| Central Oregon | Prineville Davidson Park | µg/m³ | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.6 | 3.6 | 3.5 | 3.3 | 3.2 | 3.2 | 3.1 | 3.1 | 3 | 3 | 2.9 | 2.9 | 2.8 | |||
| Central Oregon | Redmond High School | µg/m³ | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.2 | 4.1 | 4 | 4 | 3.9 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | |||
| Central Oregon | Sisters Forest Service | µg/m³ | 4.7 | 4.6 | 4.5 | 4.5 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.2 | 4.2 | 4.1 | 4 | 4 | 3.9 | 3.9 | |||
| Columbia Gorge | The Dalles Cherry Heights School | µg/m³ | 5.2 | 5.2 | 5.1 | 5 | 5 | 4.9 | 4.9 | 4.8 | 4.7 | 4.6 | 4.5 | 4.4 | 4.2 | 4.1 | 4 | 3.9 | 3.8 | 3.7 | 3.7 | 3.6 | 3.5 | 3.4 | |||
| NE Oregon | Baker City Forest Service | µg/m³ | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.2 | 4.2 | 4.1 | 4 | 4 | 4 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.7 | 3.6 | 3.5 | 3.5 | |||
| NE Oregon | Enterprise Forest Service | µg/m³ | 4.4 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4 | 3.9 | 3.8 | 3.7 | 3.6 | 3.5 | |||
| NE Oregon | Hermiston Municipal Airport | µg/m³ | 4.8 | 4.8 | 4.7 | 4.7 | 4.6 | 4.5 | 4.4 | 4.3 | 4.2 | 4.1 | 4 | 3.8 | 3.7 | 3.5 | 3.4 | 3.4 | 3.3 | 3.2 | 3.1 | 3 | 3 | 3 | |||
| NE Oregon | La Grande Hall and N | µg/m³ | 5.6 | 5.6 | 5.5 | 5.4 | 5.4 | 5.3 | 5.2 | 5.1 | 5 | 4.9 | 4.7 | 4.5 | 4.3 | 4.2 | 4.1 | 4 | 3.9 | 3.8 | 3.7 | 3.6 | 3.5 | 3.4 | |||
| NE Oregon | Pendleton McKay Creek | µg/m³ | 4.1 | 4.1 | 4.1 | 4 | 4 | 3.9 | 3.8 | 3.7 | 3.6 | 3.5 | 3.4 | 3.3 | 3.1 | 3 | 2.9 | 2.8 | 2.7 | 2.6 | 2.5 | 2.5 | 2.4 | 2.4 | |||
| Oregon Coast | Coos Bay Marshfield HS | µg/m³ | 2.6 | 2.4 | 2.4 | 2.4 | 2.4 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.4 | 2.4 | 2.4 | 2.5 | 2.5 | 2.5 | 2.6 | |||
| Oregon Coast | Florence Forestry Department | µg/m³ | 2.9 | 2.8 | 2.7 | 2.7 | 2.6 | 2.6 | 2.6 | 2.5 | 2.5 | 2.5 | 2.6 | 2.6 | 2.6 | 2.6 | 2.7 | 2.7 | 2.7 | 2.8 | 2.8 | 2.9 | 2.9 | 2.9 | |||
| Portland Metro | Beaverton Highland Park | µg/m³ | 3.8 | 3.7 | 3.7 | 3.7 | 3.7 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | |||
| Portland Metro | Carus Spangler Road | µg/m³ | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4 | 4 | 4 | 3.9 | 3.9 | 3.8 | 3.7 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.7 | |||
| Portland Metro | Forest Grove Pacific University | µg/m³ | 4.4 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.3 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | |||
| Portland Metro | Gresham Centennial High School | µg/m³ | 3.8 | 3.8 | 3.7 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.7 | 3.7 | 3.7 | 3.6 | 3.5 | 3.5 | 3.5 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | |||
| Portland Metro | Hillsboro Hare Field | µg/m³ | 4.4 | 4 | 4 | 4.1 | 4.1 | 4.1 | 4.2 | 4.2 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | |||
| Portland Metro | Portland Cully Helensview | µg/m³ | 3.5 | 3.3 | 3.3 | 3.3 | 3.3 | 3.4 | 3.4 | 3.4 | 3.5 | 3.5 | 3.5 | 3.5 | 3.4 | 3.3 | 3.2 | 3.2 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | 3.1 | |||
| Portland Metro | Portland Humboldt Sensors | µg/m³ | 3.4 | 3.4 | 3.3 | 3.3 | 3.3 | 3.3 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.3 | 3.2 | 3.2 | 3.2 | 3.2 | 3.1 | 3.2 | 3.2 | |||
| Portland Metro | Portland SE Lafayette | µg/m³ | 4.4 | 4.2 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.2 | 4.2 | 4.1 | 4 | 4 | 4 | 4 | 4.1 | 4.3 | |||
| Portland Metro | Sauvie Island | µg/m³ | 4.4 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.3 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 | 4.3 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | |||
| Portland Metro | Tualatin Bradbury Court | µg/m³ | 5.9 | 5.9 | 5.8 | 5.7 | 5.7 | 5.6 | 5.6 | 5.6 | 5.6 | 5.5 | 5.5 | 5.4 | 5.3 | 5.3 | 5.2 | 5.2 | 5.2 | 5.2 | 5.1 | 5.1 | 5.1 | 5.1 | |||
| SE Oregon | Lakeview Center and M | µg/m³ | 3.9 | 3.3 | 3.3 | 3.3 | 3.4 | 3.5 | 3.5 | 3.6 | 3.7 | 3.7 | 3.7 | 3.7 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 | 3.9 | 3.9 | 3.9 | 3.9 | |||
| SW Oregon | Ashland Fire Department | µg/m³ | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.1 | 4 | 3.9 | |||
| SW Oregon | Cave Junction Forest Service | µg/m³ | 4.2 | 3.9 | 4.1 | 4.1 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4 | |||
| SW Oregon | Grants Pass Parkside School | µg/m³ | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 2.9 | 2.8 | 2.9 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.8 | 2.7 | 2.7 | 2.7 | 2.7 | 2.6 | 2.6 | 2.5 | |||
| SW Oregon | Klamath Falls Peterson School | µg/m³ | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 | 4 | 4 | 3.9 | |||
| SW Oregon | Medford Welch and Jackson | µg/m³ | 4.5 | 4.4 | 4.4 | 4.4 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.1 | 4 | 4 | 3.9 | |||
| SW Oregon | Provolt Seed Orchard | µg/m³ | 3.4 | 3.3 | 3.3 | 3.3 | 3.3 | 3.4 | 3.4 | 3.4 | 3.4 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.2 | 3.2 | 3.2 | 3.1 | 3.1 | 3.1 | 3 | |||
| SW Oregon | Roseburg Fire Dept | µg/m³ | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.3 | 3.3 | 3.3 | 3.2 | 3.2 | 3.1 | 3 | 3 | 3 | 3 | 2.9 | |||
| SW Oregon | Roseburg Garden Valley | µg/m³ | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.6 | 3.5 | 3.4 | 3.3 | 3.3 | 3.2 | 3.2 | 3.2 | |||
| SW Oregon | Shady Cove School | µg/m³ | 3.5 | 3.3 | 3.3 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.4 | 3.3 | 3.3 | 3.2 | 3.1 | |||
| SW Oregon | Talent | µg/m³ | 4.6 | 4.1 | 4.1 | 4.1 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.3 | 4.2 | 4.2 | |||
| Willamette Valley | Albany Calapooia School | µg/m³ | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.7 | 3.7 | 3.8 | 3.7 | 3.7 | 3.6 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | |||
| Willamette Valley | Corvallis Circle Blvd | µg/m³ | 4.1 | 3.9 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4.1 | 4.1 | 4.1 | 4 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | |||
| Willamette Valley | Cottage Grove City Shops | µg/m³ | 4.9 | 4.9 | 4.8 | 4.8 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.4 | 4.3 | 4.2 | 4.1 | 4.1 | 4 | 4.1 | 4.1 | |||
| Willamette Valley | Detroit Lake Forest Service | µg/m³ | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4 | 4 | 3.9 | 3.9 | 3.8 | 3.7 | 3.6 | 3.5 | 3.5 | 3.4 | 3.3 | 3.2 | 3.1 | 3 | 2.8 | |||
| Willamette Valley | Eugene Amazon Park | µg/m³ | 5.2 | 5.2 | 5.2 | 5.1 | 5.1 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4.9 | 4.8 | 4.7 | 4.6 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | |||
| Willamette Valley | Eugene Highway 99 | µg/m³ | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4 | 3.9 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | |||
| Willamette Valley | Eugene Wilkes Drive | µg/m³ | 5.9 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.8 | 5.7 | 5.6 | 5.5 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | |||
| Willamette Valley | Lyons Marilynn School | µg/m³ | 4.6 | 4.6 | 4.5 | 4.4 | 4.4 | 4.3 | 4.2 | 4.1 | 4.1 | 4.1 | 4 | 4 | 4 | 3.9 | 3.8 | 3.7 | 3.5 | 3.5 | 3.4 | 3.4 | 3.4 | 3.4 | |||
| Willamette Valley | Mill City | µg/m³ | 4.2 | 4.2 | 4.1 | 4 | 4 | 3.9 | 3.8 | 3.7 | 3.7 | 3.6 | 3.6 | 3.5 | 3.4 | 3.4 | 3.3 | 3.3 | 3.2 | 3.1 | 3 | 3 | 2.9 | 2.9 | |||
| Willamette Valley | Oakridge | µg/m³ | 4.1 | 4.1 | 4 | 3.9 | 3.8 | 3.7 | 3.6 | 3.6 | 3.5 | 3.4 | 3.4 | 3.3 | 3.2 | 3.2 | 3.1 | 3.1 | 3 | 2.9 | 2.8 | 2.7 | 2.6 | 2.6 | |||
| Willamette Valley | Salem State Hospital | µg/m³ | 4 | 4 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.7 | 3.7 | 3.6 | 3.5 | 3.4 | 3.4 | 3.3 | 3.4 | 3.4 | 3.4 | 3.3 | |||
| Willamette Valley | Silverton James and Western | µg/m³ | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.2 | 4.1 | 4.1 | 4 | 4 | 4 | 4 | 4 | 3.9 | |||
| Willamette Valley | Springfield City Hall | µg/m³ | 5.3 | 5.3 | 5.2 | 5.1 | 5 | 4.9 | 4.8 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.5 | 4.4 | 4.3 | 4.2 | 4.1 | 4 | 4 | 4 | 4 | |||
| Willamette Valley | Sweet Home Fire Department | µg/m³ | 4.5 | 4.3 | 4.3 | 4.3 | 4.5 | 4.5 | 4.4 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4 | 3.9 | 3.8 | 3.7 | 3.6 | 3.5 | 3.5 | 3.5 | 3.5 | |||
| Willamette Valley | Turner Cascade Junior HS | µg/m³ | 4.8 | 4.8 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.5 | 4.5 | 4.4 | 4.3 | 4.3 | 4.2 | 4 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.8 | 3.8 |
