What happens to CFCs and HCFCs in the atmosphere?

• A. They become ozone
• B. They are quickly decomposed
• C. They remain stable for years
• D. They promote rain formation

Answer: (C)

CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons) are known for their stability in the atmosphere. They do not break down quickly due to their chemical structure. This stability allows them to remain in the atmosphere for several years, sometimes even decades. As they rise into the stratosphere, they can reach the ozone layer where they undergo photodissociation, releasing chlorine atoms that contribute to ozone depletion.

This characteristic of long atmospheric lifetimes is key in understanding their environmental impact, particularly concerning the thinning of the ozone layer, which protects the Earth from harmful ultraviolet radiation. Thus, the understanding that these substances remain stable for years is crucial for addressing their role in ozone depletion and implementing regulations for their use.