Environment & Ecology · Environment
At what specific threshold level of atmospheric ozone concentration is an area officially designated as an 'ozone hole'?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Below 100 Dobson Units (DU)
- 2Below 300 Dobson Units (DU)
- 3Below 150 Dobson Units (DU)
- 4Below 220 Dobson Units (DU)✓
Correct answer
Below 220 Dobson Units (DU)
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