What is the cause pollution of air?

What is the cause pollution of air? 用英文回答what is the cause of water pollution? Factory-a leading cause of the air pollution翻译是‘工厂--造成空气污染的罪 These diesels cause most of the pollution. what is the cause of heavy smoking? What is air pollution?哪些是空气污染 英语翻译　　Pollution Haze　　Recently,the topic of air pollution ha why air pollution is the most serious? Air pollution is one of the major problems of the modern wor What is about 20% of the air? what is the cause of.what 作主语吗 It is urgent that the acute problem of air pollution in the