We live in a earth is suffering from serious air pollution. Air pollution from factories, burning garbage, automobile exhaust is the root of atmospheric pollution. Their time to affect our respiratory tract and lungs, make the incidence of respiratory system rise year by year.

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When slightly polluted air, the human body by inhalation of air in the nasal cavity nose hair to remove part of the dust, again by mucus in the nasal cavity and all kinds of bronchial mucus will dust adhesion in live. Tracheal and bronchial cilia in the tens of millions of root, they swing around 12 times per second, from the bottom up like a "cleaner" push sweep the mucus in the airway, until the throat, again through the cough cough up in vitro.

When serious air pollution, the purification of the respiratory effect will be reduced, or even completely lost. In this case, the descent of the respiratory tract and lungs vulnerable to germs and suffering from various diseases.

Due to various reasons, also increase in air pollution. If you can't solve the problem of air pollution, really, I'm afraid one day, human can only live with a mask.

我们生活的地球正遭受着严重的空气污染。工厂排放的废气、燃烧的垃圾、汽车的尾气等都是污染大气的祸源。它们时刻侵袭着我们的呼吸道和肺，使呼吸系统的发病率逐年上升。

当空气轻微污染时，人体吸入的空气可以由鼻腔里的鼻毛除去部分灰尘，再由鼻腔里的黏液和各类支气管里的黏液将灰尘粘连住。气管和支气管内的纤毛有几千万根，它们每秒约摆动12次，像“清洁工”一样从下向上推扫呼吸道里的黏液，直至咽喉部，再通过咳嗽咳出体外。

当空气严重污染时，呼吸道的净化作用将降低，甚至完全丧失。在这种情况下，呼吸道和肺易受病菌的侵袭而患各种疾病。

由于种种原因，空气污染还在加剧。如果不能解决空气污染的问题，恐怕真有一天，人类只能带着口罩生活。