Polluting substances, smog and acid rains

The man, letting polluting substances in the atmosphere, can provoke irretrievable damages
to human beings, even if these substances are present in very small quantities. The smog can be considered as a whole of powders and poisonous gases. It is produced by motor vehicles, industrial emissions and by domestic heating systems. The industrial emissions combine with the water vapour present in the atmosphere and fall again to the earth as acid rains, in these damage forests, rivers, lakes, the human beings living there and finally the monuments of our towns.
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