Table 1.
Source contributions to fine particle mass and elemental concentrations (ng/m3) at Harvard Supersite.
| Regional Pollution | Motor Vehicles | Sea Salt | Crustal/Road Dust | Oil Combustion | Wood Burning | Estimate | Measured | %MRE | |
|---|---|---|---|---|---|---|---|---|---|
| BC | 105 | 350 | 1 | 3 | 81 | 43 | 583 | 658 | 12 |
| Na | 69 | 0 | 18 | 5 | 30 | 21 | 174 | 195 | 11 |
| Al | 9 | 7 | 0 | 29 | 1 | 1 | 47 | 47 | 1 |
| Si | 3 | 12 | 0 | 52 | 0 | 0 | 67 | 67 | 0 |
| S | 729 | 151 | 2 | 10 | 66 | 12 | 971 | 980 | 1 |
| Cl | 0 | 1 | 14 | 0 | 0 | 0 | 15 | 15 | 2 |
| K | 6 | 0 | 1 | 7 | 0 | 23 | 37 | 37 | 0 |
| Ca | 1 | 9 | 1 | 13 | 4 | 1 | 28 | 29 | 3 |
| Ti | 0 | 1 | 0 | 1 | 0 | 0 | 3 | 3 | 0 |
| V | 0 | 0 | 0 | 0 | 3 | 0 | 3 | 3 | 1 |
| Fe | 0 | 37 | 0 | 17 | 6 | 0 | 61 | 61 | 1 |
| Ni | 0 | 0 | 0 | 0 | 2 | 0 | 2 | 3 | 2 |
| Cu | 0 | 2 | 0 | 1 | 0 | 1 | 3 | 4 | 8 |
| Zn | 0 | 5 | 0 | 0 | 2 | 3 | 10 | 11 | 9 |
| Pb | 1 | 1 | 0 | 1 | 1 | 1 | 5 | 5 | 9 |
| PM2.5 | 4,220 | 1,836 | 48 | 383 | 663 | 1,648 | 8,798 | 9,353 | 6 |