We were interested in fine particles (PM1), that is to say particles with an aerodynamic diameter less than 1µ, because these particles, unlike coarse particles (PM10) penetrate deeply into the air. respiratory system and are likely to pass into the bloodstream. Ultrafine particles with a diameter of less than 0.1µ can pass into the circulation and be found in all organs; however, current measurement techniques do not allow routine field measurements of these ultrafine particles to be easily carried out on a routine basis. Here we measure the number of particles per unit volume and not the mass of particles per unit volume. Indeed, this mass count is essentially representative of large particles, the finest having a negligible mass, although having a large developed surface area and therefore a significant biological effect.
Document published on (Fr) : Société de Pneumologie de Langue Française