g more and more serious all over the world. For example, cars have made the air unhealthy for people to breathe and poisonous gas is given off by factories. Trees on the hills have been cut down and waste water is being poured continuously into rivers. Furthermore, wherever we go today, we can find rubbish carelessly disposed. Pollution is, in fact, threatening our existence. Air pollution Many things can cause air pollution, such as the emission of the car, burning gabbage and other waste materials like plastic products. All kinds of emissions causing air pollution, and causing the greenhouse effect. The measures of reducing the air pollution: Accuse the factories which give off the waste exhaust gas. Prohibit friends smoking. Encourage the people around you plant more trees.
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