Question

Smog that occurs due to low temperature and has reducing environment is

• A. Photochemical smog
• B. Los Angeles smog
• C. Nonsulphurous smog
• D. London smog

Answer 1

The correct option is D London smog

Smog is the fog containing smoke. Smog is of two types depending upon the type of pollutants; classical smog and photochemical smog.

• Classical smog, also known as London smog or Sulphurous smog, is formed when there is high concentration of sulphur dioxide and particulate matter produced due to combustion of fuels. It occurs in cold and humid climate and has reducing nature.
• Photochemical smog, also known as Los Angeles smog, is formed when sunlight acts on the oxides of nitrogen and hydrocarbons produced from factories or by automobiles. It occurs in warm and dry climate and has oxidising nature.

Hence, the smog that occurs due to low temperature i.e. in cold climate, and has reducing environment is classical smog or London smog.

So, the correct answer is 'London smog'.