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Source contributions to coarse particle mass and elemental concentrations (ng/m3) at Harvard Supersite
| Crustal/Road Dust | Motor Vehicles | Sea Salt | Estimated | Measured | %MRE | |
|---|---|---|---|---|---|---|
| Na | 21 | 17 | 99 | 137 | 155 | 12 |
| Al | 98 | 14 | 5 | 117 | 115 | 2 |
| Si | 235 | 40 | 0 | 275 | 273 | 1 |
| Cl | 3 | 9 | 245 | 258 | 263 | 2 |
| K | 38 | 8 | 5 | 51 | 52 | 1 |
| Ca | 24 | 101 | 0 | 125 | 125 | 0 |
| Ti | 9 | 3 | 0 | 12 | 12 | 0 |
| Mn | 2 | 1 | 0 | 4 | 4 | 12 |
| Fe | 143 | 56 | 4 | 203 | 211 | 4 |
| Cu | 2 | 2 | 0 | 3 | 3 | 6 |
| Zn | 2 | 2 | 0 | 4 | 5 | 10 |
| Br | 1 | 1 | 0 | 2 | 3 | 21 |
| Ba | 11 | 9 | 1 | 21 | 27 | 21 |
| PM2.5-10 | 2,782 | 981 | 732 | 4,495 | 5,049 | 11 |
