| month | [PM2.5] (μg・m−3) | |||
| Beaver | Chalkyitsik | Circle | Ft. Yukon | |
| May | -.- (-.-) | 5.4 (6.5) | 1.9 (2.0) | 5.4 (5.4) |
| June | -.- (-.-) | -.- (-.-) | 3.7 (3.8) | 8.7 (12.7) |
| July | 15.1 (34.8) | 4.3 (5.5) | 6.5 (8.6) | 5.9 (20.3) |
| August | 5.5 (13.2) | 2.8 (3.2) | 4.9 (6.2) | 4.4 (5.7) |
| September | 5.7 (14.2) | 3.4 (3.5) | -.- (-.-) | 7.2 (11.1) |