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Today, the quality of life in large cities is decreasing, discuss the causes and solution. Nowadays, metropolitan life is going to fall down in quality rapidly especially in large cities. Most of the cities have common problems that cause to decrease quality of life standards to decrease in urban regions. This article addresses the main causes and discusses the remedy that can be taken to deal with it. First and foremost, the giant disaster in big cities is air pollution. This causes is caused by huge numbers of personal vehicles and smokestack industries in urban areas. Furthermore, the main components of pollution are carbon monoxide and nitrogen dioxide that are vital parts of acid rain. Certainly, this rain not only can easily destroy stones that are used in buildings but kills aquatics and other creatures also. Another aspect of air pollution completely deals with inhabitant’s health. Scientists believe that grass- roots of lung cancer is breathing dirty air. On the other hand, mega cities like Tehran are growing extraordinary extraordinarily in population. Many individuals commute every day to capital city cities for work or other purposes. This leads to tremendous traffic on ingoing or outgoing roots routes of big city cities during the day and night. From my point of view, the government plays prominent role to in these concerns. By spreading ofwith spread of public transportations like the metros or buses besides make introducing strict bans of using personal cars especially in early time, most of the mentioned population tends to use them. In conclusion, most of large cities all around the world have similar anxiety like air pollution, traffic congestion and crimes. So for healing and eliminating of these common worries, all large cities should follow the method of successful cities like Copenhagen in proper ways.