Question

question 4 (5 points)
what is primarily destroying the ozone layer of the atmosphere?
a) chlorofluorocarbons
b) sulfur dioxide
c) nitrogen dioxide
d) ground-level ozone

Explanation:

🆕 New Concept Discovered: Ozone Depletion Mechanisms
How human-made chemicals break down stratospheric ozone.

Step 1: Identify the primary cause of ozone depletion

The stratospheric ozone layer protects Earth from harmful ultraviolet (UV) radiation. Scientific consensus has established that human-made chemical compounds containing chlorine and bromine are the primary drivers of ozone destruction.

Among these, chlorofluorocarbons (CFCs) are the most significant contributors. When CFCs reach the stratosphere, UV light breaks them down, releasing free chlorine atoms. A single chlorine atom can catalyze the destruction of tens of thousands of ozone molecules (\(\text{O}_3\)).

Step 2: Evaluate the other options

• b) sulfur dioxide (\(\text{SO}_2\)): Primarily associated with acid rain and industrial air pollution, not direct stratospheric ozone destruction.
• c) nitrogen dioxide (\(\text{NO}_2\)): While nitrogen oxides can play a role in atmospheric chemistry, they are not the primary driver of the global ozone hole compared to CFCs.
• d) ground-level ozone (\(\text{O}_3\)): This is a pollutant in the lower atmosphere (troposphere) that makes up smog, rather than a substance that destroys the protective stratospheric ozone layer.

Answer:

a) chlorofluorocarbons