For noise pollution is one of the problems with violence, particularly in the major cities of Viet Nam at present, which is caused by the sound of a car horn and. In a country where there are a lot of motorcycle, it is said that in Viet Nam, there are currently a number of motorcycles reaches 18 million cars and cars (all types) there are a number of approximately 700000 Khan.In major cities, especially during emergency The sound of a motorcycle, and a very loud trumpet it can be/affect the ear health. In addition, there are also noise pollution coming from the construction. Building demolition construction Manufacture of metal products in the community, located in the city.
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