Dobson units $(DU)$ are used to measure the thickness of:

Which day is celebrated as World Ozone Day?

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

Recognizing the deleterious effects of ozone depletion,an international treaty was signed at Montreal in $1987$ to control the emission of ozone-depleting substances,which is known as $.........$.

The Montreal Protocol refers to: