​There are a lot of disadvantages of living in a big city, but air pollution, traffic jam, and the high living standard are three main disadvantages. Firstly, air pollution is a big disadvantage that people living in big cities have to face. Big cities attract a lot of investments of inside and outside country, so the number of factories is increasing fast. This makes the air extremely polluted by smoke from factories, trucks, and motorbikes. As a result, more and more people get many serious diseases, such as lung cancer, tuberculosis and so on. Next is traffic jam. There are a lot of people and transportation in big cities, so traffic jam is an unavoidable problem. People can not go to work on time because they are always stuck for hours in rush hour. Besides, transport system which is stuck will cause a lot of serious problems. For example, ambulance and fire engine can not get in time to complete duty, so there is a big loss of humans and property. It also takes a lot of money of producers when their goods do not get in time. Lastly, the living standard in big cities is very high. Nowadays, the development of big cites is faster and faster, so these big cities become big economic centers of country. Because of that, public services such as health service, postal service, etc cost a lot. It will be difficult for the poor and workers to live in big cities because they have to pay too much for public services while their salary is too low. In conclusion, it is not easy to live in a big city.