WHO on the air quality in investigation, covering 91 countries around the world about 1100 cities, including the capital has a population of more than 100000 countries and more cities. The data shows, because air pollution is serious, part of the countries and regions in the air particles contains more than 15 times, so that the global standard a year die from air polluter of more than 200 ten thousand people.ugg boots sale， PM10 particles for equal to or less than 10 microns particles can penetrate into the lung and blood circulation, and lead to heart disease, lung cancer, asthma and acute lower respiratory infections.

WHO clearly laid air quality standards, including the years shall be with average PM10 20 micrograms per year, but some/cubic meter of the city has reached 300 micrograms PM10 / m3, so that an annual average of more than 200 people for air pollution to death. Many urban areas with the air particles to increase, and power plant and the discharge of gases, such as locomotive is particles floating in the air increased levels of reason. WHO the public health and environment department priests nirah, said dr dust and smoke exhaust factory or power plants burn coal and produce soot, often make urban air is dirty. Many countries have no air quality regulations, even if so, national standards and implementation is big also different. ugg boots outlet，Nirah, says dr if can to the environment monitoring and management, appropriate suffering from respiratory diseases, heart disease and lung cancer will number can be greatly reduced.

Air pollution is the atmosphere pollutants concentration degree of harmful to the environment, more than quality standards and damage the ecological system and the normal human living conditions, the people and objects to cause harm to the phenomenon. Those who could make the air quality of bad matter is air pollutants. Air pollutants to February 2009, about 100 DuoZhong known. A natural factors (such as forest fire, volcanic eruptions, etc) and human factors (such as industrial waste gas, life of coal, car tail gas, nuclear, etc.) two, and with the latter is given priority to, especially the industrial production and transportation caused. The main pollution sources, air emissions by process communication, people and things suffer the three links that form. Affect the atmosphere pollution limits and strength of the factors of the nature of the pollutants (physical and chemical), the nature of the pollution sources (the source strong, the source, the source of temperature, high exhaust rate), meteorological conditions (wind direction, wind speed, temperature layer ", etc), the surface properties (terrain ups and downs, roughness, ground covers, etc.).cheap coach store， Control method are many, basic way is reform production process, comprehensive utilization, will destroy in production process of pollutants; In addition, overall planning, rational distribution, reduce the pollution; dense residents In the high pollution area, limit traffic flow; Choose appropriate design chimney site, and appropriate height, reduce the pollution of the ground; In the most adverse weather conditions and take measures to control emissions of pollutants.