Environmental pollution in general and in particular air pollution is one of the most serious problems in the world. In Vietnam, the air quality at very low levels as "Environmential Performance Index" again ranked Vietnam among 10 of the 178 countries on the worst air pollution index. "The growth of the economy has brought about an increase in the number of vehicles required for transport. It has led to a significant increase in emissions. in the city - which has a large population and dense traffic density, most people are separate motorcycles, besides the significant increase of the car. the bus most part only student use, for those who go to work they always use motorcycles "even for very short distances. "the smoke from thermal power plants, dust from these works are part of the cause of pollution. There are a number of measures are being implemented to reduce air pollution in Vietnam. the Government is "tightening standards for new vehicles." This is increasing the tax rate on personal vehicles, the level of environmental protection tax, use tax charges. some experts have suggested "banning motorcycles in the big city "to reduce the large number of vehicles on the road, but" proposed "met much opposition. And with the help of several organizations Metro project was implemented in two major cities of Hanoi and Ho Chi Minh City. However, capacity constraints in the street to make the Metro project has been delayed for years. Project Clean Air for Smaller Cities in the ASEAN region was established to help small cities in the ASEAN region improved their air quality systematic way. They use an "emissions inventory" to find the source of contamination and expansion. And to reduce pollution, "Based on the emission inventories, measures to reduce air pollution will be proposed in the clean air plan aims".
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