Question

Which of the following statement/s is/are correct with regard to ozone depletion:
1. The ozone hole is measured in terms of ozone concentrations, which is expressed in Dobson units.
2. The major cause for ozone depletion is the presence of CFCs in the stratosphere - CFCs are entirely man-made and not found naturally.

• A. Only 1
• B. Only 2
• C. Both A and B
• D. None of the above

Answer 1

The correct option is C Both A and B

• CFCs and other halogenated ozone depleting substances (ODS) are mainly responsible for manmade chemical ozone depletion.
• The total amount of effective halogen (Chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine.

So, the correct option is 'Both A and B'.