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The London smog was observed in the year -


1. 1750
2. 1952
3. 1972
4. 2000

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Correct Answer - Option 2 : 1952

The correct answer is 1952.

  • The London smog was observed in the year 1952.

  • The London smog 
    • Great Smog of London, lethal smog that covered the city of London for five days (December 5–9) in 1952.
    • It was caused by a combination of industrial pollution and high-pressure weather conditions.
    • This combination of smoke and fog brought the city to a near standstill and resulted in thousands of deaths.
    • Itis is also known as classical smog.
    • Physician Harold Des Veaux coined the word smog in 1905 to describe natural fog contaminated by smoke: smoke + fog yielded smog.

  • Photochemical smog or Los angels smog 
    • This type of smog is prevalent in dry and sunny areas of the world.
    • Automobiles emit smoke which contains hydrocarbons and nitrogen dioxide, these compounds under the action of sunlight become the major component of photochemical smog.
    • This smog contains a high concentration of oxidizing agent hence it is also known as oxidizing smog.
    • It was first observed in Los angels, USA, in 1943.

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