Table 1.
Metal content in PM polluted air in μg/m3.
| Element | PM2.5–10 (μg/m3/PM) |
PM<2.5 (μg/m3/PM) |
UFPM (μg/m3/PM) |
|---|---|---|---|
| Antimony | n.d. | n.d. | n.d. |
| Arsenic | n.d. | n.d. | n.d. |
| Cadmium | n.d. | 0.0022 | 0.0011 |
| Cobalt | 0.0026 | 0.0037 | 0.0016 |
| Lead | 0.0023 | 0.0343 | 0.011 |
| Nickel | 0.0025 | 0.012 | 0.0053 |
| Palladium | n.d. | n.d. | n.d. |
| Platinum | n.d. | n.d. | n.d. |
| Rhodium | n.d. | n.d. | n.d. |
| Vanadium | n.d. | 0.0016 | 0.0025 |
| Zinc | 0.042 | 0.2650 | 0.078 |
Heavy metal concentrations in PM sourced from Riverside, California. Metals present at or above the detection level are in shown in bold. The abbreviation n.d. indicates no detection.