Answer:
Industrialisation
has led to increased pollution of air in following ways:
(i) Due to industrialisation, the consumption of fossil fuels has
increased.
Combustion of fossil fuels has increased production of
gases like 
and 
which
are toxic.
(ii) There has been depletion in the ozone layer because
of increase in the production of chemicals like chlorofluorocarbons which are
used as insulators, refrigerants, solvents and aerosol propellants. This has
resulted in the entry of UV rays into Earth's atmosphere, which has affected various
organisms.
(iii) Combustion of fossil fuels also increases the amount
of suspended particles in air causing pollution.
Steps taken to check air pollution are:
(i) Planting more trees, as they purify air by intake of
CO2 gas and release of O2. This will reduce the greenhouse
effect.
(ii) Reducing the consumption of fossil fuels.
(iii) Laying emphasis on the use of non-conventional
sources of energy like wind energy, solar energy, tidal energy, etc., which
reduce pollution to great extent.
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