Air pollution can be produced by - the fumes - the combustion heaters providing domestic and urban - the exhaust from automobiles (1) and all engines - The burning of waste outside of the planned facilities therefor; - The flight in the wind products stored without special precautions.
These different sources of pollution sent into the air of dust and gases more or less dangerous. The various dust, particles of unburned carbon, living germs (bacteria, mold spores, etc..) Can accumulate over some cities and thus form a sort of gray cap to float altitudes between 1 500 and 2 500 m and can absorb some solar radiation (20% in summer and 50% in winter).
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