Ozone holes are more pronounced at the

Concept

Pronounced ozone holes form when an extremely cold stratosphere creates polar stratospheric clouds inside an isolated polar vortex. Reactions on these clouds activate chlorine and bromine; returning sunlight then drives rapid ozone destruction.

Application

The equator and the Tropics of Cancer and Capricorn are low- or subtropical latitudes, not polar-vortex regions. The severe recurring ozone hole is centered over Antarctica near the South Pole, which is not one of the three named locations.

Contrast

• Equator — warm tropical stratospheric conditions do not sustain the cold isolated vortex responsible for the Antarctic ozone hole.

• Tropic of Cancer — this subtropical latitude lies far outside the Antarctic polar-vortex region.

• Tropic of Capricorn — although it is in the Southern Hemisphere, this subtropical latitude is still far from the Antarctic polar region.

• More than one of the above — none of the three named low- or subtropical latitudes is the Antarctic polar region, so the aggregate statement is not supported.

• None of the above — the actual location, the polar region and especially Antarctica, is absent from the named geographic choices.

Cross-check

NASA and the UNEP Ozone Secretariat describe the ozone hole as exceptionally depleted stratospheric ozone over Antarctica, produced by polar stratospheric-cloud chemistry inside the cold polar vortex.

Therefore, the answer is None of the above.