Abstract
Generally, particles dispersed in air arise, comparatively to gaseous pollutants, specific metrological problems because of the influence of various parameters of their own, such as particle size, shape, electric charge, concentration in the air, etc. The physical behavior of the particles changes drastically depending on these parameters, the most important of them being the size. For these reasons, the characterization of particles dispersed in air is more complex than the characterization of gases or vapors. In this section, we present the concepts of equivalent diameters of the particles (aerodynamic, thermodynamic, electrical mobility) and their suitability to describe the different behaviors of particles according to their nanometer or micrometric size when dispersed in air. We show later the basic principles used in aerosol metrology to characterize these equivalent diameters and quantify particles with different metrics (number, surface, mass).
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