प्र: Ozone hole refers to which

• 1
  hole in ozone layer
• 2
  decrease in the ozone layer in troposphere
• 3
  decrease in thickness of ozone layer in stratosphere
• 4
  increase in the thickness of ozone layer in troposphere
• 5
  hole in ozone layer
• 6
  decrease in the ozone layer in troposphere
• 7
  decrease in thickness of ozone layer in stratosphere
• 8
  increase in the thickness of ozone layer in troposphere
• 9
  hole in ozone layer
• 10
  decrease in the ozone layer in troposphere
• 11
  decrease in thickness of ozone layer in stratosphere
• 12
  increase in the thickness of ozone layer in troposphere