Table 1.
Relative abundance of pollutants in PM2.5 from Beijing
| Pollutant | Min. concentration (%) | Max. concentration (%) |
|---|---|---|
| Aluminum | 23 | 37 |
| Calcium | 13 | 17 |
| Iron | 28 | 29 |
| Arsenic | 0.015 | 0.02 |
| Zinc | 0.17 | 4 |
| Copper | 0.15 | 0.25 |
| Cadmium | 0.005 | 0.12 |
| Lead | 0.17 | 0.5 |
| Polycyclic aromatic hydrocarbon PAH (4) | 0.015 | 0.02 |
| Polycyclic aromatic hydrocarbon PAH (5,6) | 16 | 31 |
Analysis of PM2.5 indicted that the most abundant components were Al (23–37%), PAH (5,6) (16–31%), Fe (28–29%), Ca (13–17%) and Zn (0.17–4%). Others were present at less than 1%. Ambient PM2.5 samples were collected in Beijing on each day of measurement from November 2009 to June 2010.