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.
空气质量用年平均细颗粒物的浓度表示(PM 10至PM 2.5，即粒径小于等于10或2.5微米的细颗粒)。
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).
伊朗西南部城市阿瓦士不幸成为空气最糟城市，该市空气中小于10微米的颗粒物含量是最高的。
The southwest Iranian city of Ahvaz walked away with the unfortunate distinction of having the highest measured level of airborne particles smaller than 10 micrometers.
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