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Smog

Smog

Smog is polluted air containing high concentration of dust and toxic gases whose source is mainly motorization and industry. Two types of smog are distinguished:

  • Los Angeles-type smog (photochemical, oxidizing smog) may appear from July to October in temperature 24-35oC, it reduces visibility to 0.8-1.6 km (the air is brownish). The main pollutants are: carbon dioxide, nitric oxides, aromatic and unsaturated hydrocarbons, ozone, industrial dusts. So that smog could appear, strong solar exposure of the air is necessary whereas neither smoke nor fog have a considerable influence.
  • London-type smog (acid, "sulfurous") may appear in temperature -3 - 5oC, it reduces visibility even to tens of kilometres. The main air pollutants are: sulphur dioxide, carbon dioxide, dusts. Smog causes dyspnoea, makes eyes water, irritates skin. It has also a strong corrosion influence on the environment.