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  komarjazdek 24.4.2013 (15:46)

  mouse the house security

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  Olenka20045 24.4.2013 (21:16)

  Air pollutants are the main causes of global environmental threats, such as ozone depletion, acid rain, the greenhouse effect. Most common and most polluting the atmosphere of sulfur dioxide, nitrogen oxides and air pyły.Zanieczyszczenia are all gaseous substances, solid or liquid, in the air in quantities greater than the average content. There are both natural substances (such as pollen, dust, volcanic), as well as resulting from human activities (flue gas, industrial dust). Polluted air, as such, the chemical composition can adversely affect the health of humans, plants and animals, as well as other elements of the environment (water, soil). Air pollution is the most dangerous of all pollutants, as moving and can contaminate large areas all the elements of the environment.
  No natural sources of air pollution include: chemical fuel conversion, extraction and transportation of raw materials, chemical industry, refineries and iron and steel, cement, raw materials and waste disposal, automotive.
  Natural sources of air pollution include volcanic eruptions, wind erosion of rocks, cosmic dust, some biological processes, forest fires and steppes.

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