What is the cause behind "Ozone depletion"?

Both 2 and 3

The correct answer is Option 4: Both 2 and 3

Explanation:

• Increase in the level of CFCs: Chlorofluorocarbons (CFCs) are a major cause of ozone depletion. When CFCs are released into the atmosphere, they eventually reach the stratosphere where they are broken down by UV radiation, releasing chlorine atoms that destroy ozone molecules.

• Increased usage of AC, refrigerators etc.: The use of air conditioning, refrigerators, and other appliances that contain CFCs and other ozone-depleting substances (ODS) has historically contributed to the increase in atmospheric levels of these harmful compounds, exacerbating ozone depletion.

"The problem of ozone depletion is caused by high levels of chlorine and bromine compounds in the stratosphere. The origins of these compounds are chlorofluorocarbons (CFC), used as cooling substances in airconditioners and refrigerators, and bromofluorocarbons (halons), used in fire extinguishers."