Ozone hole is defined as the thickness of the ozone layer below
240 DU
220 DU
200 DU
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What scientists call the Antarctic Ozone “Hole” is an area where the ozone concentration drops to an average of about 100 Dobson Units. One hundred Dobson Units of ozone would form a layer only 1 millimeter thick if it were compressed into a single layer, about the height of a dime.
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average thickness of ozone layer is 300 DU
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