These are named for the size , in microns , of the particles .

它们是按照粒子微米下的体积来命名的。

It refers to the smallest solid particles in the atmosphere-those less than 2 microns across .

它指的是大气中的最小的固体微粒那些直径小于或等于2微米的。

It refers to the smallest solid particles in the atmosphere-those less than 2.5 microns across .

这次词说的是在大气层中所有直径小于2.5微米的可吸入固体颗粒物。

Chinese authorities now publish data on larger air particles , of up to 10 microns in diameter .

中国有关部门目前公布的是对直径最高可达10微米的更大颗粒物的监测数据。

Cooler dust emits at 22 microns , so it looks red in wise images .

寒冷的尘埃发出22微米的光，所以在wise图像上是红色。