Q. Consider the following statements
1.Fly ash is a secondary pollutant.
2.O3 in the stratosphere is generated in the presence of light and it is a secondary pollutant.
Which of the above statement/s is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: B
Notes:

Fly Ash:

  • Fly ash a fine powder, which is the by-product of burning pulverisedcoal in thermal power plants.
  • It is a type of Suspended Particulate Matter so it is primary pollutant.
  • Composition: Fly ash includes substantial amounts of oxides of Si, Al and Ca. Heavy toxic elements like Arsenic, Boron, Chromium, lead etc. are also found in trace concentrations.

Ozone (O3):

  • Ozone in the lower atmosphere is formed from molecular O2when in the presence of sunlight when Reactive Oxygen Species are generated. ROS combines with O2 and form Tropospheric Ozone. Thus, O3 is generated in the troposphere and is termed as “Bad Ozone”.
  • It is a secondary pollutantas it is normally not present in atmosphere and generated from other primary source.

Source: ForumIAS

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