Despite the convenience and opportunities, living in a city has several problems worth considering. Firstly, the pollution is increasing rapidly in the big cities. There are more and more private vehicles such as cars or motobikes in the cities, which means that more and more exhaust is being exposed into the air causing air pollution. As the city develops, many factories come into operation and create a great amount of sewage to the natural water bodies. Secondly, traffic jam is also among the most serious of cars, buses and trucks. The most significant effect of traffic congestion is increasing people's anger and frustration. In conclusion, these problems need considering carefully to find out the solutions.

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