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We all know that clean air is important to good health. Wherever you go and whatever you do, you are always surrounded by a sea of gases that we call air. If there are impurities in the air, they may be absorbed by our bodies and make us ill. We need clean air, but unfortunately , air pollution is globally present , especially in cities.

Many large cities are anything but pollution-free. Our cities have many factories, which we need to make food, clothing and other things. Every year these factories pour millions upon millions of tons of smog into air. Power plants and houses that burn coal add greatly to air pollution. Besides , there are more cars in cities now. Once out on the streets, they will take in fresh air and replace it with poisonous gases.

Our country is trying hard to prevent and control air pollution. As long as every citizen also realizes its importance and makes join efforts, the day will come soon when people will take in only clean air. Then , the sunlight will no longer be blackened out by smoke and soot.

我们都知道，空气清新，是非常重要的身体健康。不管你去哪里，不管你做什么，你总是由气体，我们称之为空海所包围。如果空气中有杂质，它们可能会吸收我们的身体，使我们生病。我们需要清洁的空气，但不幸的是，空气污染是目前全球，尤其是在城市。

许多大城市是什么，但无污染。我们的城市有很多工厂，我们需要使食品，衣物和其他东西。这些工厂每年都倒在空气中的烟雾进入亿万吨。发电厂燃烧煤和房屋，大大加重了空气污染。此外，在城市有更多的汽车企业。一旦走上街头，他们将在新鲜空气和有毒气体取代它。

我国正努力防止和控制空气污染。只要每个公民也意识到它的重要性，使参加的努力，总有一天人们会很快在只有清新的空气。然后，阳光将不再是由黑，烟灰。