'World Ozone Day' is celebrated on

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Correct — C, 16th September. The International Day for the Preservation of the Ozone Layer — commonly called World Ozone Day — is observed every year on 16 September. The date marks the anniversary of the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer on 16 September 1987. The United Nations General Assembly proclaimed the day in 1994 (resolution 49/114) to raise awareness of ozone-layer depletion and the phase-out of ozone-depleting substances such as chlorofluorocarbons (CFCs).

Why the other options are wrong — (a) Wrong — 25 December is not an environmental observance related to the ozone layer; the ozone day is fixed to the Montreal Protocol anniversary of 16 September.  (b) Wrong — no ozone observance falls here; the well-known April environmental date is Earth Day on 22 April, which is a different, broader campaign.  (d) Wrong — 30 January is observed in India as Martyrs' Day (anniversary of Mahatma Gandhi's death); it has no connection with the ozone layer.

Concept: The ozone layer in the stratosphere absorbs most of the Sun's harmful ultraviolet (UV-B) radiation. Man-made chemicals — chiefly CFCs, halons and related compounds — release chlorine and bromine that catalytically destroy ozone, thinning the layer and creating the seasonal Antarctic 'ozone hole'. The 1987 Montreal Protocol, one of the most successful environmental treaties, committed nations to phasing out these substances, and World Ozone Day (16 September) commemorates its signing.

State PCS 2021 Q43 — Environment & Ecology PYQ with Answer

State PCS 2021 Q43 — Environment & Ecology PYQ with Answer