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At present the air pollution, especially in urban areas is no longer an individual issue of a country or region in which it has become the global problem. In Quang Ninh, in some municipalities, large transport shafts were contaminated with different levels. Air pollution is the presence of strange substances in the air, or the important transformation in atmospheric composition that affects human health, creatures and other ecosystems. So what causes that lead to the situation? First due to air from coal mining plants. Quang Ninh has a rich, diverse mineral source, there are many different types of high-quality reserves that many cities do not have to be. The coal mining for years has caused much adverse fluctuations in the environment. The second cause is due to the appearance of cement factories. Smoke, dust from cement factories that make up homes, trees, human living widgets always in the allusion of white dirt erase, dust smoke has been lowering the lives of people around the cement factories. Because most of the cement factories are used to handle the obsolete furnace technology, the process is not guaranteed for environmental sanitation. The third cause was due to coal mining factories. The dust concentration caused by the mining plant was much higher than it allowed, even with a standard 9-fold high dust concentration area. Besides, these plants have been discharged from a large amount of harmful gases such as CO., SO2... these are very toxic gases to the environment and the workers in these institutions. The next reason is due to transportation activities. In Quang Ninh, the number of motorcycles, the automobile rises very quickly does not only increase the emissions that pollute the air at regular peak times causing traffic congestion. Emissions from transportation have become the primary source of polluters for urban air environments, most major towns such as Haiphong, Hanoi, Ho Chi Minh City, Quang Ninh,.... The next reason is due to the culinary flexibility of the people. In Quang Ninh Municipality, the main people are the principal of coal or coal burning, which is the primary source of polluters with indoor air environment, directly affecting the health of people. The last cause is due to living waste. This is no need to tell you, too. This is the consequences we suffer from. So how do we fix it? If you want to help make the city clean and well to help yourself each person then we need to treat the smell, avoid the problem of litter in public by writing the slogan, the propaganda table hangs everywhere. At the same time remind and sanctions strictly those who litter indiscriminately, increasing the number of trash in public places, entertainment areas such as stations, docks,,... parks.