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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