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Option 2 : Ozone
Option 2 is the correct answer: Ozone is the major contributor to photochemical smog.
Ozone:
- Ozone is an allotrope of Oxygen, with molecular formula O3.
- It is stabilised by resonance i.e. delocalisation of electrons.
- It is a pale blue coloured gas present in our the stratosphere layer.
- It protects us from the harmful Ultraviolet Rays coming from the sun.
- The chlorofluorocarbons (CFCs) are the ozone-depleting agents originating from Air Conditioners, Refrigerators and Aerosols.
- Montreal Protocol was signed on September 16, 1987, for the protection of Ozone, that entered into force on January 1, 1989.
- But when Ozone is present at ground level, instead of atmosphere it acts as a pollutant.
Photochemical Smog:
- The term smog is a combination of words smoke + fog.
- Photochemical smog is formed as a result of the reaction of chemical compounds in the presence of sunlight.
- In photochemical smog, Ozone is formed after the reaction of Nitrogen oxide and Volatile Organic Compounds (VOC) in the presence of sunlight.
- Ozone can damage lung tissues and cause respiratory illness.
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