Air quality is represented by annual mean concentration of fine particulate matter (PM10 and PM2.5, i.e. particles smaller than 10 or 2.5 microns).
空气质量用年平均细颗粒物的浓度表示(PM10至PM 2.5，即粒径小于等于10或2.5微米的细颗粒)。
Fine particulate matter - particles smaller than 2.5 micrometers - can evade hairlike projections in the nose and trachea that trap larger particles.
细颗粒物——小于2.5微米的颗粒——能躲过鼻子和气管中绒毛的保护作用。
Fine particulate matter - particles smaller than 2.5 micrometers - can evade hairlike projections in the nose and trachea that trap larger particles.
细颗粒物——小于2.5微米的颗粒——能躲过鼻子和气管中绒毛的保护作用。
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