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. 