Page 135 - Genius Kidz Prudence Learning Sc-8

AIR POLLUTION (c) On the basis of their ability to undergo

(a) Definition : Any undesirable change in the degradation.
physical, chemical or biological properties (i) Biodegradable sources : These are
of air is called air pollution. Pollutants that those that can be degraded by nature,
cause air pollution are called air for example, vegetation ash, etc.
pollutants. (ii) Non-biodegradable sources : These are

(b) Sources of air pollution : On the basis of those that cannot be easily degraded by
their origin : nature, for example, explosives, etc.

(i) Natural sources : (d) Common Air Pollutants
Volcanoes (i) Carbon monoxide:

Ashes Colourless gas
Forest fire, etc. Odourless gas

Most important air pollutant
Produced by incomplete combustion of
fuels.

Effects : Carbon monoxide can combine

with haemoglobin–red coloured blood
pigment to form carboxyhaemoglobin. Due
to the formation of carboxyhaemoglobin,

the supply of oxygen is reduced in the body
that, in turn, results in dizziness, headache
and can even lead to death.
Natural sources of air pollution
(ii) Carbon dioxide : Carbon dioxide is
(ii) Artificial or man-made sources :
present in a particular amount in
Industries environment, it is not a pollutant. But if its

Deforestation concentration is increased above the
Vehicles permissible level then it acts as a very
prominent greenhouse gas.

Effects : Greenhouse effect.
It is the phenomenon of the rise in
temperature of the earth's crust due to the
absorption of solar radiation by

greenhouse gases. This heat energy
absorbed can’t escape back into the space.

Man-made sources of air pollution Greenhouse effects is not a curse because

Giraffes can live longer without water than camels.

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