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Ozone layer is important for us to protect us from UV rays. Which of the following is correct regarding ozone?
Ozone is a non-pollutant gas.
Ozone is a pollutant gas for human beings and non-pollutant gas for animals.
Ozone is a pollutant gas for both animals and human beings.
Ozone gets converted into oxygen in the human body.
Ozone is a pollutant gas for both animals and human beings.
While stratospheric ozone acts as a protective shield against harmful ultraviolet radiation, ground-level or tropospheric ozone is a highly toxic secondary pollutant. It is a potent oxidant that causes respiratory irritation, reduced lung function, and damage to biological tissues in both humans and animals.
While stratospheric ozone acts as a protective shield against harmful ultraviolet radiation, ground-level or tropospheric ozone is a highly toxic secondary pollutant. It is a potent oxidant that causes respiratory irritation, reduced lung function, and damage to biological tissues in both humans and animals.
Think of ozone like 'fire': it is essential for life when used in a fireplace (stratosphere) to keep you warm, but if it breaks out inside your living room (troposphere), it becomes a destructive hazard.
Ozone: 'Good up high, bad nearby.'
NO2тАЛ(g)h╬╜тАЛNO(g)+O(g) тАФ Photodissociation of nitrogen dioxide
O(g)+O2тАЛ(g)MтАЛO3тАЛ(g) тАФ Formation of tropospheric ozone
Tropospheric ozone is formed by photochemical reactions involving nitrogen oxides (NOxтАЛ) and volatile organic compounds (VOCs) in the presence of sunlight. The reaction sequence involves the photolysis of NO2тАЛ to form NO and atomic oxygen (O), where O reacts with O2тАЛ to produce O3тАЛ. This ozone is highly reactive and damages the mucosal linings of lungs upon inhalation.
Stratospheric ozone (upper atmosphere) is beneficial as it filters harmful UV-B and UV-C rays.
Tropospheric ozone (ground level) is a constituent of photochemical smog.
Ozone is a strong oxidizing agent capable of damaging plant tissues and causing respiratory diseases in animals.
It is classified as a secondary pollutant because it is not emitted directly but formed through chemical reactions.
UV-B radiation protection in the stratosphere
Effective water disinfectant in controlled industrial settings
Causes photochemical smog at ground level
Highly toxic to respiratory systems of animals
Causes degradation of rubber and certain materials
Water purification (ozone treatment)
Bleaching agent in paper and textile industries
Ozone concentration in the stratosphere is measured in Dobson Units (DU).
Option A is incorrect because ozone is toxic at ground level. Option B is incorrect as it is equally harmful to all air-breathing animals, not just humans. Option D is incorrect as ozone does not convert to oxygen inside human cells but causes oxidative damage instead.
C is correct тАФ Ozone acts as a dangerous secondary pollutant in the troposphere that harms the respiratory systems of all air-breathing animals and humans.
Always distinguish between the 'Good' (stratospheric) ozone and 'Bad' (tropospheric) ozone in exam questions; they exist in different atmospheric layers with completely different chemical impacts.
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