"Ozone Day" is observed on:

World Ozone Day was observed on..........

The World Environment Day is observed on

AIDS Day is observed on

AIDS Day is observed on

The "World Intellectual Property Day" is observed on

The "World Intellectual Property Day" is observed on

The "World Intellectual Property Day" is observed on

The Ozone Day is observed every year on September 16 as on this day in 1987 the _______ was signed for launching efforts to arrest the depletion of the fragile ozone layer in the stratosphere that prevents the harmful ultra violet rays of the sun from reaching the earthh, Fill the correct word in blank.