The city of Hanoi and Ho Chi Minh City as the two cities have a speed increase of road transport largest all over the country. The number of vehicles in Ho Chi Minh City takes up to 1/3 of the country's transportation.Overall, the quality of motor vehicles has improved, but the increase does not stop the number of personal vehicles (cars, motorcycles) in terms of narrow transport system, lack of planning, ... has caused no less pressure for environmental managers in solving the problem of air pollution in General and urban air pollution in particular.
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