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Inhalable dust: the fraction by mass of the total particles which are inhaled by mouth or nose and which contain at least 50% of particles with an aerodynamic diameter in excess of 100 microns.Inhalable dust comprises the upper-thoracic fraction (particles of a dimension ranging between 7 and 10 microns which do not pass beyond the larynx) and the thoracic fraction (particles of a dimension ...

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