Figure 3From: A single-particle characterization of a mobile Versatile Aerosol Concentration Enrichment System for exposure studies Pie charts showing the pre- and post-concentrator fractional abundances of the eight main classified particle types for characterization studies A and B. The particle classes detailed in the legend are plotted clockwise from the top of each pie chart. (Particle diameters in the range 0.2–3.2 μm).Back to article page