Environmental Protection Agency (EPA) MVAC Certification

CFCs have been shown to deplete stratospheric ozone. Over which area has a significant hole in the ozone layer developed?

1. Arctic

2. Antarctica

3. Australia

4. North America

The correct answer is: Antarctica

CFCs (chlorofluorocarbons) have been linked to the depletion of the ozone layer, particularly over Antarctica. The unique climatic and atmospheric conditions in the Antarctic region contribute to the development of a significant hole in the ozone layer. During the polar winter, stratospheric temperatures drop, allowing for the formation of polar stratospheric clouds. These clouds enable chemical reactions that convert benign chlorine compounds into reactive forms that lead to the rapid destruction of ozone as spring arrives and sunlight returns. The phenomenon is especially pronounced in Antarctica due to the combination of its extreme cold and the presence of CFCs, causing a pronounced seasonal thinning of the ozone layer every year. As a result, this region has gained particular attention in discussions about ozone depletion and the effects of human-made chemicals on the atmosphere. Hence, the significant hole in the ozone layer is primarily associated with Antarctica.