Q. Consider the following statements regarding the ozone layer:
1.It is mainly found in the troposphere, between 15 and 35 km above the Earth’s surface.
2.Under the 1987 Montreal Protocol, countries agreed to phase out ozone-depleting substances and replace them with safer alternatives.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: B
Notes:

Explanation:

  • Statement 1 is incorrect because the ozone layer is primarily located in the stratosphere, not the troposphere, at an altitude of about 15–35 km.
  • Statement 2 is correct as the Montreal Protocol (1987) is a global agreement aimed at phasing out ozone-depleting substances (ODS) such as CFCs and replacing them with environmentally safer alternatives.

Source- NASA

Blog
Academy
Community