Which statement is wrong about ozone lay...

Which statement is wrong about ozone layer ?

A

Bad ozone formed in the lower atmosphere (troposhpere).

B

The thickness of ozone is measured in terms of dobson unit (DU)

C

Major ozone depleting substance is CFC.

D

Montreal protocol was signed at montreal (canada) in 1986 (effective in 1988)

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The correct Answer is:

D

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