The pollution coming from the industries

The industries, especially the chemical ones, give out from their chimneys hydrocarbons, dioxide sulphur, dioxide nitrogen, ammonia and monoxide
carbon
.


The fumes, heavier than the air, form a mantle of stinking and irrespirable smog.

In 1952 in London about 4,000 persons died as direct or indirected victims of the smog.

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