"Good ozone" is found in the .........

The ozone layer in the upper atmosphere is depleted by $.........$.

Which of the following atmospheric pollutants is directly involved in the depletion of the ozone layer?

Supersonic jets cause pollution by thinning the layer of ...........

In the stratosphere,which of the following elements acts as a catalyst in the degradation of ozone and the release of molecular oxygen?

Which of the following statement$(s)$ is/are correct?
$(i)$ The Montreal Protocol was signed in $1987$ and became effective in $1989$.
$(ii)$ 'Good' ozone is found in the troposphere.
$(iii)$ Ozone is formed by the action of $UV$ rays on molecular oxygen and degrades into molecular oxygen.
$(iv)$ $CFCs$ are responsible for the imbalance between the production and degradation of ozone.
$(v)$ $DNA$ and proteins of living organisms absorb $UV$ rays.