Figure 1

Representative TEM images of airborne nanoparticles. (A) (B) and (C) illustrate the most commonly observed morphologies of airborne nanoparticles emitted from the photocopy machines, A smaller number of particles contained heavy metals, as illustrated by the energy dispersive spectroscopy spectra in images (D) and (E). F, Pie chart representation of chemical composition. [Cu signal is from the TEM grid]. (Reproduced with permission from Bello et al 2012).