Table 4.
Source contributions to outdoor PM2.5 mass and elemental concentration (ng/m3)
| Road dust | Motor vehicles | Secondary pollution | Soil dust | Marine aerosols | Biomass burning | Estimate | Measured | %MRE | |
|---|---|---|---|---|---|---|---|---|---|
| Mass | 209.2 | 1,698.7 | 2,630.9 | 434.8 | 75.0 | 1,107.2 | 6,155.8 | 6,497.3 | 5.3 |
| BC | 68.0 | 365.0 | 66.1 | 2.8 | 2.5 | 29.0 | 533.4 | 628.0 | 15.1 |
| OC | 400.3 | 846.7 | 485.8 | 0.0 | 13.3 | 811.3 | 2,557.4 | 2,868.6 | 10.8 |
| Sulfate | 0.0 | 287.3 | 1,314.8 | 0.0 | 9.4 | 40.0 | 1,651.5 | 1,508.4 | 9.5 |
| Al | 0.1 | 0.0 | 6.6 | 17.9 | 0.5 | 1.6 | 26.7 | 23.4 | 14.1 |
| Ca | 13.1 | 3.1 | 0.0 | 4.1 | 0.8 | 0.4 | 21.5 | 21.0 | 2.4 |
| Cl | 0.0 | 0.0 | 0.0 | 0.9 | 25.9 | 0.0 | 26.8 | 32.7 | 18.0 |
| Cu | 0.1 | 1.1 | 0.1 | 0.5 | 0.0 | 0.6 | 2.4 | 2.4 | 0.0 |
| Fe | 7.5 | 26.3 | 0.0 | 12.0 | 0.2 | 0.0 | 46.0 | 46.1 | 0.2 |
| K | 0.0 | 0.0 | 0.0 | 8.2 | 0.5 | 30.5 | 39.2 | 37.9 | 3.4 |
| Mg | 2.3 | 0.0 | 9.7 | 4.2 | 3.1 | 2.5 | 21.8 | 21.9 | 0.5 |
| Na | 25.5 | 13.2 | 49.6 | 0.0 | 24.7 | 1.4 | 114.4 | 128.7 | 11.1 |
| Pb | 0.3 | 1.3 | 0.4 | 0.5 | 0.0 | 0.5 | 3.0 | 2.9 | 3.4 |
| Si | 4.5 | 0.4 | 2.9 | 36.1 | 0.1 | 0.0 | 44.0 | 44.4 | 0.9 |
| Ti | 0.1 | 0.7 | 0.1 | 1.1 | 0.0 | 0.3 | 2.3 | 2.2 | 4.5 |
| Zn | 0.5 | 3.8 | 0.0 | 0.2 | 0.1 | 2.6 | 7.2 | 8.0 | 10.0 |