The pollution of air is mainly due to two reasons: the factories emit waste gas and the automobile release exhausted gas .
Since Industrial Revolution, human began to build factories and produced produtions. Some kinds of factories can produce waste gas which can pollute the air. Everyday a lot of factories emit waste gas continually. If this waste gas emited arbitrary before process to a accepable level, the air will be pollute seriously.
Another important factor is the gas emit by the automobile. The automobile can emit waste gas when they are operating, therefore they can pollute the air as well. What's more, the number of automobile is incresing subsequently everyday. The pollution from the automobile may keep on incresing in the future.
Since the air pollution problem is very serious, people should take care of it and take some mesures to protect the air.
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