Fig. 8.

Open-faced PHISH fractional collection efficiency defined as the concentration measured on each sampler component relative to the concentration measured by a sharp-edged isokinetic sampler as a function of particle size and type (solid particles versus droplets) at 0.4 m s⁻¹ wind speed. Black bars represent fractional collection efficiency for solid particles by gravimetry (i.e. the sampling efficiency). Gray bars represent the collection efficiency the filter (i.e. the sampling efficiency); white bars depict the collection efficiency of the cassette estimated by wiping the inside of the open-faced PHISH and cassette as determined by fluorescence analysis.