Air pollution is a major change in the composition of the atmosphere, mainly from smoke, dust, soot, steam or air makes strange gas is not clean, there was a smell coming, reduced visibility, caused climate change, pathogenic for humans and creatures.

Air pollution caused more than 3 million people die prematurely every year, it threatens virtually all of the big city dwellers in the developing countries. According to Fox News 80% of cities in the world can not meet the standards of the World Health Organization (WHO) on air quality, which is mainly concentrated in poor countries. WHO said the level of urban air pollution worldwide has increased by 8% despite improvements in some areas. This leads to the risk of stroke, heart disease, lung cancer and a variety of respiratory problems

Causes of environmental pollution are mainly caused by human activities. Besides, there are also some other natural activities that have impact on the environment. Specifically, there are 5 causes of environmental pollution:

The wastes from factories, factories, industrial zones
During the operation, industrial zones are one of the causes of environmental pollution. The reason is due to the burning of fossil fuels: coal, oil, gas creates: CO2, CO, SO2, NOx, unburnt organic substances: soot, dust, process loss, leakage on technological lines, in the processes of transporting volatile chemicals, dust.

According to environmental experts, the cause of air pollution from industrial activities has a high concentration of toxic substances, often concentrated in a small space.

Plant protection agents and chemical toxins
Currently, the application of scientific and technical advances to agricultural production is increasingly promoted. However, to ensure the crop, people have overused plant protection drugs for plants.

Spraying large amounts of chemicals on plants not only affects the health of people when using them, but also pollutes the soil environment when a large amount of drugs is not absorbed by the plants.

This is the cause of soil degradation and pollution.

Solid wastes are not disposed of safely
The process of industrialization also leads to an increase in a large amount of solid waste including domestic waste, industrial waste, medical waste, agriculture, agricultural waste, construction waste, etc.

According to the 2004 report on solid waste, the country has about 15 million tons / year, of which about 150,000 tons is hazardous waste. It is forecasted that by 2010 the amount of solid waste could increase from 24% to 30%.