Table 2.
Group-averaged PM elemental composition in μg/g
| Summer | Winter | Winter/Summer | |||
|---|---|---|---|---|---|
| Element (μg/g) | CAPs | CAPs + O 3 | CAPs | CAPs + O 3 | Enrichment factor |
| Al | 951 | 622 | 2303 | 2250 | 2.9 |
| As | 14.8 | 14.2 | 20.3 | 15.5 | 1.2 |
| Ba | 304 | 101 | 335 | 239 | 1.4 |
| Ca | 1159 | 1033 | 4548 | 4200 | 4.0 |
| Cd | 2.4 | 2.3 | 9.2 | 6.9 | 3.5 |
| Co | 7.6 | 1.9 | 3.6 | 5.3 | 0.9 |
| Cr | 39.6 | 44.8 | 56.6 | 38.4 | 1.1 |
| Cu | 848 | 360 | 683 | 540 | 1.0 |
| Fe | 5053 | 4695 | 14946 | 10027 | 2.6 |
| K | 3637 | 5018 | 10392 | 7128 | 2.0 |
| Li | 6.3 | 11.6 | 32.6 | 21.3 | 3.0 |
| Mg | 386 | 271 | 2304 | 1690 | 6.1 |
| Mn | 442 | 688 | 2273 | 1481 | 3.3 |
| Mo | 10.3 | 6.7 | 17.7 | 7.8 | 1.5 |
| Na | 2404 | 3899 | 17638 | 13795 | 5.0 |
| Ni | 17.8 | 18.0 | 48.2 | 31.3 | 2.2 |
| P | 312 | 78 | 234 | 494 | 1.9 |
| Pb | 133 | 79 | 220 | 157 | 1.8 |
| SO 4 | 276531 | 294486 | 240898 | 160234 | 0.7 |
| Sb | 39.8 | 27.9 | 88.8 | 63.4 | 2.2 |
| Se | 29.0 | 37.4 | 50.3 | 40.8 | 1.4 |
| SiO 2 | 3822 | 1705 | 11341 | 6179 | 3.2 |
| Sn | 33.7 | 18.2 | 66.3 | 48.3 | 2.2 |
| Sr | 14.1 | 7.5 | 38.4 | 29.6 | 3.1 |
| Ti | 140 | 80 | 279 | 242 | 2.4 |
| V | 9.8 | 12.6 | 43.0 | 32.5 | 3.4 |
| Zn | 367 | 534 | 1475 | 1128 | 2.9 |
| Organic C | 287078 | 341624 | 448280 | 357174 | 1.3 |
| Elemental C | 14582 | 25329 | 49299 | 34830 | 2.1 |