UPSC General Studies Sample Paper General Studies Sample Paper-8

  • question_answer
    Photochemical smog is one of the crucial pollutants of the traffic congested metropolitan cities. where warm conditions and intense solar radiations are present. Which of the following as components of photochemical smog?
    1. Ozone                      
    2. Peroxyacetyl nitrate
    3. Nitrogen oxide           
    4. Sulphur dioxide
    Select the correct answer using the codes given below.

    A)  2 and 3           

    B)  1, 2 and 3

    C)  2 and 4           

    D)  All of these

    Correct Answer: B

    Solution :

    [b] Two distinct type of smog are recognised. 1. Sulfurous smog results from a high concentration of sulfer oxides being released into the air, because of burning fossil fuels. This type of smog is prevalent in London and is sometimes referred to as 'London smog'. 'While the burning of coal is the major reason why sulfur oxides are released into the air, the other causes stem from the production of crude oil and metallic ore. Sulfurous smog had been known to cause respiratory problems and can be a particular concern for those who have asthma. 2. Photochemical smog contains hydrocarbons Nitrogen Oxide (NO and A/Ox). Ozone, Peroxyacetyl Nitrate (PAN) arc Volatile organic compound are characterised by warm, dry arc sunny climate. This is oxidising smog, because it has nor concentration of AISO called "LOS Angeles smog".

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