Which would also screen out particulate matter dangerous to human health.

该过滤器还筛选出危害人类健康的颗。

This includes increased monitoring of particulate matter in the air.

包括监测空气中的悬浮颗等。

These particles can travel deep inside human lungs and are mostly created by burning fuels.

这些颗深入人体肺部，主要由燃烧燃料产生。

Larger particles, known as PM 10, are linked to agriculture, roadways, mining or wind-blown dust.

较大的颗（称为PM 10）与农业、道路、采矿或风扬尘有关。

We block over 99 of particulate of the same size.

我们阻挡了九十九多个相同大小的颗。

Common combustion products include hydrocarbons, oxides of nitrogen and sulfur, ammonia and particulate matter.

常见的燃烧产包括碳氢化合、氮和硫的氧化、氨和颗。

The new research shows that multiple drops travel in a cloud.

这项新的研究显示呈云雾状轨迹的众多颗。

It urged more action to reduce particulate matter that damages lungs.

促采取更多行动来减少损害肺部的颗。

But County Health Director Christine Stinson says particulate matter is a concern.

但该县卫生主任克里斯汀·斯廷森表示，悬浮颗是一个令人担忧的问题。

The PM2.5 measurement means the particles are 2.5 microns or less in diameter.

PM2.5的测量的意思是颗的直径小于或等于2.5微米。

IQAir measures air pollution based on the presence of airborne particles that damage the lungs.

IQAir根据空气中含有的对肺部有害的颗的浓度来测量空气污染水平。

And one of the primary measurements for the Index is particulate matter 2.5.

该指数的主要测量指标之一是“颗 2.5”。

The average concentration of PM2.5 hazardous particles was 30 micrograms per cubic meter, down 9.1 percent year-on-year.

细颗（PM2.5）平均浓度为 30 微克/立方米，同比下降 9.1%。

Bush fires produce particulate matter pollution, which are airborne particles small enough to enter the lungs.

丛林大火会产生颗污染，颗是空气中的微小颗，进入肺部。

Particulate matter comes in various sizes.

颗有各种大小。

To put the matter in perspective, most scientists say particulate matter standards are like speed limits.

大多数科学家都一致表示，客观来讲，颗标准就如同限速标准。

Heavier particles drop out first, but about five times further out than had been previously predicted.

较重的颗最先下落，但仍然比之前预测到的距离远5倍上。

And the small ones swirl around and can be carried 200 times past previously predicted distances.

小的颗则会呈现蜗旋状态并且是预测的实际能移动距离的200倍之多。

The particles are what stand between iron coming out of the glaciers and the Southern Ocean.

这些颗阻碍了从冰川中释放出来的铁抵达南大洋。

In parts of the capital levels of fine particulate matter reached 30 times the limit deemed safe.

在首都的某些地方，大气细颗的含量达到了最低安全指标的30倍。