空气质量的好坏与我们的身体健康以及生产生活密切相关。近些年来出现的雾霾天气让我们越加关注空气质量问题，然而在社会进步的同时，空气污染却越来越严重。请围绕“airpollution”这一话题，写一篇英语作文。 要求： (1)题目自拟，立意自定； (2)观点明确，条理清晰，语言流畅； (3)篇幅在250词左右。
Air Pollution Air pollution is one of the major problems of the modern world. A great deal of energy is needed to run the factories of modern industrial nations. Automobiles, trains, planes and busses need energy, too. Nearly all of this energy is produced by burning fuels. The burning produces wastes, some of which remain in the air, causing air pollution. Many large cities are anything but pollution-flee. 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 bum 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. Scientists are finding ways to stop air pollution especially in big industrial areas and densely-populated cities. They are studying new ways of generating electricity that may be less damaging to the environment. At the same time, many power plants are being modernized to give off less polluted material. Also, engineers try to design and locate new power plants to do minimum damage to the environment. However, it may be that we still have a long way to go before we have a clean world. Nearly all of the countries are trying hard to prevent and control air pollution. There indeed seems to be no end to tasks that environ mentalists will be required to do. People will continually find new ways to control pollution.
