Although still widely measured, total mass of airborne particles is only weakly correlated with observed health effects. Indeed, the German Occupational Exposure Agency has identified "small, i.e. < 500 nm, insoluble particles" as most dangerous; emission legislation has started to use particle number concentration as lead indicator for nanoparticle emissions from combustion; and health experts favour particle surface by far over mass to express particle toxicity.
Matter Engineering offers an all-in-one solution with the Diffsusion Size Classifier product line, DiSC. DiSC is an electrical particle counter measuring particle number surface, and mass concentration simultaneously, as well as mean particle diameter.
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