Abstract
A three-stage dilution system has been constructed which mixes a puff of smoke immediately after generation with filtered air without apparent coagulation. Aerosol particles are then serially aspirated and mixed with clean air to achieve dilution of 126,000:1. Using this dilution system, it was possible to analyze the aerodynamic size distribution of cigarette smoke with a single particle aerodynamic relaxation time (SPART) analyzer with minimum coincidence loss. The cigarette smoke leaving the butt end of a cigarette was found to have a particle concentration of 4.2 × 10 9 particles/cm 3, with MMAD of 0.43υm. The experimental design and calibration of the dilution is briefly described.
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