The situation of depletion of ozone layer is referred as ozone hole. I – McqOptions

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1.	The situation of depletion of ozone layer is referred as ozone hole. If the ozone level decreases below (PTET Feb 2011)
A.	800DU
B.	400DU
C.	200DU
D.	None of the above
Answer» D. None of the above

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