As we know, cities are the meeting points of culture and people. In the big cities, you will find many factories and enterprises. I think it is also a factor which lead to air pollution – the most serious problem in the big cities.

 Air pollution is a major change in the composition of the air, mainly due to dust or gases being released into the air. I suppose that air pollution is due to two main factors:

One is the natural factors such as: forest fires, dust storms, … Another is human factors like: Industry,  transportation or daily activities in people’s lives .

 Air pollution has caused many consequences: it has killed many plants, animals, and it leads to many diseases for humans such as cancer ...

 So how to overcome this situation where the air is heavily polluted in the big cities? I would like to put forward some measures:

Firstly, replacing the machines which cause much pollution .

Secondly, limiting the construction of industrial areas in the big cities .

Thirdly, encouraging people to travel by public transport to reduce smokes and fumes.

 To sum up, I hope that my measures above are useful to dealing with air pollution in the big cities. Air pollution is a serious problem and is not easy to solve it immediately but anyway, people should figure out how to prevent it with their ability.