Table1. Particle Number and Particle Surface Area per 10 µgm-3 Airborne Particles. (Oberdörster G et al., 2005)
| Particle Diameter (Nm) |
Particle Number (cm-3) |
Particle Surface Area (µm2.cm-3) |
| 5 |
153,000,000 |
12,000 |
| 20 |
2,400,000 |
3,016 |
| 250 |
1,200 |
240 |
| 5,000 |
0.15 |
12 |
Source: SCENIHR  The appropriateness of existing methodologies to assess the potential risks associated with engineered and adventitious products of nanotechnologies (2006),
3.9 Exposure Scenarios, p. 35
|
