The PM2.5 index, for examples.

比如去看看PM2.5的指数。

So I'm going to write ... PM 2.5, that's incorrect.

那么我要写下...PM2.5，再划掉。

Now, we've noticed PM2.5, which has long been neglected.

如今，我们又开始关注被长期忽略的PM2.5。

That means the respirator is effective against dust, pollen and PM2.5.

也就是说这种口罩可以有效过滤灰尘、花粉以及PM2.5。

WHO released an interactive map showing the pollutants known as PM2.5 for all countries.

世界卫生组织还公布了一个动态世界地图来展示PM2.5对于世界各国的污染。

To research the possible heart lesion of sensitive individuals exposed to PM2.5 in short term.

了解敏感个体急性暴露PM2.5可能出现的心脏损伤。

This is PM 2.5. These particles -- you can see it right now, but when they're out there in the air, you won't see them.

这就是PM2.5（可吸入颗粒物）。虽然这些微粒现在肉眼可见，但是当它们散布在大气中时，几乎看不到。

Reducing the concentration of PM2.5, which is particulate matter with a diameter of 2.5 microns or smaller, has become a target of the Beijing municipal government, Fang said.

方力指出，降低PM2.5（直径小于等于 2.5 微米的颗粒物）浓度已成为北京市政府的工作目标之一。

Cloaked: Beijing's trade centre building. PM2.5 can play a role in heart disease and lung ailments such as emphysema and cancer.

消失于无形：北京贸易中心大楼。PM2.5值是导致肺气肿和癌症等心脏疾病和肺病的重要影响因素。

Swallowed: Monument to the People's Heroes. The air was full of the dangerous PM2.5 particulate, which gets deep into the lungs.

吞噬：人民英雄纪念碑。空气中充满了对人类有害的PM2.5极细颗粒物，可以直接被人吸入到肺里面。