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Particulate Matter简称PM,PM2.5是指大气中直径小于或等于2.5μm的颗粒物。这类颗粒物的直径相当于人类头发直径的1/10～1/20。一般情况下直径在10μm以上的颗粒物,会被挡在人体鼻腔内部的绒毛外面,而粒径在2.5μm～10μm之间的颗粒物,因为人体的生理结构不易被阻挡,能够进入上呼吸道,
Particulate Matter referred to as PM, PM2.5 refers to the atmospheric particles less than or equal to 2.5μm in diameter. The diameter of these particles is about 1/10 to 1/20 the diameter of human hair. Under normal circumstances, the diameter of particles above 10μm, will be blocked in the human body inside the hair outside the villi, and particle size between 2.5μm ~ 10μm particles, because the body’s physiological structure is not easily blocked, to enter the upper respiratory tract,