Question

What is Classical smog ?

• A. Dark brown smog
• B. Yellow brown smog
• C. Los angeles smog
• D. Smog with secondary pollutants

Answer 1

The correct option is A

Dark brown smog

Explanation for the correct option:

Option (A):Dark brown smog

• The term smog is derived from two words - Smoke and fog and it is known as the most common type of atmospheric pollutant which affects a major portion of the world.
• Classical smog consists of smoke, fog, and Sulphur dioxide components and is mostly found in humid conditions.
• They are generally present where there is a high concentration of particulate matter and Sulphur dioxide is produced due to the combustion of fuels.
• Hence, it causes a dark brownish atmosphere which is why they are also known as dark brown smog.

Explanation for the incorrect option:

Option (B): Yellow-brown smog

• Yellow-brown smog which is also known as a type of photo chemical smog contains high levels of nitrogen which gives it a characteristic yellow-brown color.
• Classical smog is not represented as the Yellow-brown smog.
• Hence, the given option is the incorrect one.

Option (C): Los Angeles smog

• A new type of smog, known as photochemical smog is produced when sunlight reacts with the nitrogen oxide and volatile organic compounds in the atmosphere.
• Los Angeles, California, and Mexico City have high smog levels hence photochemical smog is also known as Los Angeles smog.
• Thus, Los Angeles smog does not consider the Classical smog.

Option (D): Smog with secondary pollutants

• Smog with secondary pollutants basically contains secondary pollutants like ozone, nitric acids, etc.
• Also, Smog with secondary pollutants is not represented as Classical smog.
• Hence, the given option does not coincide with the correct option.

Hence, Classical smog is Dark brown smog.