What chemical indicates ozone depletion in the stratosphere?

• A. Chlorofluorocarbon
• B. Chlorine monoxide (ClO)
• C. Carbon dioxide
• D. Methane

Answer: (B)

Chlorine monoxide (ClO) is the chemical that indicates ozone depletion in the stratosphere. This compound plays a crucial role in the depletion of the ozone layer because it is a product of the breakdown of chlorine-bearing substances, such as chlorofluorocarbons (CFCs). When CFCs reach the stratosphere, they release chlorine atoms under ultraviolet radiation, which then react with ozone molecules (O3). The formation of ClO is part of the ozone destruction cycle, where one chlorine atom can deplete thousands of ozone molecules before it is inactivated or removed from the stratosphere.

Understanding the role of ClO emphasizes the significance of monitoring and managing substances that contribute to ozone depletion. While chlorofluorocarbons are linked to ozone depletion, they are not the direct indicator in the atmosphere. Carbon dioxide and methane are greenhouse gases that have different environmental impacts and are not directly related to ozone layer depletion.