你是否有这样的经历，出去旅游或者出差一段时间，走的时候把门窗都关的好好的，回来桌子上还是落了很多灰尘，这是为什么呢？这其实是自然作用，比如风蚀海潮，人为活动，大到工业生产小到每个人身上脱落的皮肤碎屑，都无时无刻不在把各种各样肉眼看不到的微小颗粒物散布到大气中，其中颗粒比较大的会在重力作用下迅速沉降，而颗粒略小的则能较久地悬浮在空气中。在黑暗的房间里打开指向性良好的强光手电或是激光笔，你便能在本该空无一物的房间里看到一条“光柱”，这就是光线打在空气中颗粒物上折射出来造成的。这样即使关了窗，没有外界的灰尘进来，经过一段时间，空气中本来就含有的灰尘也依然会慢慢沉降下来，积聚在桌面上。在医药、微电子等生产行业，即使这些空气中悬浮的微小灰尘也能对产品造成严重损害，因此需要采用严格的空气净化措施，给生产车间供应过滤过的无尘空气以提高生产质量。
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