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What is the primary cause of ozone depletion in the upper atmosphere?
Carbon monoxide
Chlorofluorocarbons (CFCs)
Methane
Sulfur dioxide
Chlorofluorocarbons (CFCs)
Chlorofluorocarbons (CFCs) release active chlorine atoms under ultraviolet radiation in the stratosphere, which catalytically break down ozone molecules. This catalytic chain reaction accounts for the primary anthropogenic thinning of the ozone layer. Global phase-out is enforced via the Montreal Protocol.
Chlorofluorocarbons (CFCs) release active chlorine atoms under ultraviolet radiation in the stratosphere, which catalytically break down ozone molecules. This catalytic chain reaction accounts for the primary anthropogenic thinning of the ozone layer. Global phase-out is enforced via the Montreal Protocol.
Stratosphere layer (10-50 km altitude) and the Montreal Protocol signed in 1987 (effective 1989) targeting ozone-depleting substances.
UV radiation breaks CFC molecules in the stratosphere to release free chlorine atoms.
One chlorine radical can catalytically destroy over 100,000 ozone molecules.
Ozone depletion is most severe over Antarctica during spring due to polar stratospheric clouds.
Option A (Carbon monoxide) is a toxic pollutant and tropospheric gas involved in smog, not stratospheric ozone depletion.
Option C (Methane) is a greenhouse gas affecting tropospheric chemistry, distinct from halogen-driven ozone catalytic cycles.
Option D (Sulfur dioxide) causes acid rain and sulfur aerosols, contributing to regional cooling rather than catalytic ozone loss.
B is correct тАФ Chlorofluorocarbons (CFCs) directly cause catalytic depletion of stratospheric ozone.
Relate ozone depletion mechanisms with atmospheric temperature stratification (temperature increases with altitude in stratosphere due to UV absorption) and environmental protocols tested in RRB/SSC exams.
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