世界卫生组织建议可吸入颗粒物的上限为20微克，这种体积的颗粒物将导致严重的人体呼吸系统疾病。
WHO recommends an upper limit of 20 micrograms for PM10s, which can cause serious respiratory problems in humans.
其中细颗粒物(PM 2.5)由于能够进入人体呼吸系统，甚至能穿透肺细胞进入血液循环，从而对人体健康造成更大的危害。
Because PM2.5 can enter human respiratory system, even penetrate through lung cells into the blood circulation, it bring worse harms to human health.
一套新的空气质量评估体系拟把PM 2.5检测值纳入其中。PM 2.5是造成天气阴霾，并能损害人体呼吸系统的微小空气污染物。
A new set of air-quality evaluation standards under discussion is likely to include readings of PM2.5, the tiny airborne pollutants that cause haze and can damage the human respiratory system.
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