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A pocket-size portable particle size detector for diesel and cigarette smoke aerosols is being designed using particle size and composition methods. Aerodynamics, fluid properties, material composition and aerosol composition are taken into account. Testing methods for the design include using an impactor and virtual impactor with two quartz crystal resonators to determine particle composition using the change in quartz crystal resonant frequency. Particles are deposited onto the quartz surface or remain in a minor channel which is used to determine particle size and the concentration of particles in aerosol. The COMSOL Multiphysics® Poincare Map and built in integrations are used to count particles through each outlet and determine volumetric flow rates.