Ozone-depleting substances (ODS) are compounds that significantly damage the Earth’s ozone layer, a vital component of the stratosphere responsible for shielding life on the planet from harmful ultraviolet (UV) radiation. These substances, predominantly human-made, have been widely used in various industrial and consumer applications, including refrigeration, air conditioning, insulation, and aerosol propellants. ODS typically contain chlorine or bromine atoms, which are released into the atmosphere upon their usage. Once in the atmosphere, these atoms can catalytically destroy ozone molecules, leading to the formation of the infamous ozone hole\u2014a region of significantly depleted ozone concentrations, primarily observed over Antarctica. The discovery of ODS and their adverse effects on the ozone layer prompted international action, culminating in the landmark Montreal Protocol in 1987, which aimed to phase out the production and consumption of these harmful substances. Despite significant strides in ODS reduction, ongoing vigilance and global cooperation remain essential to safeguarding the ozone layer and mitigating the risks posed by ozone depletion to human health and the environment.<\/p>\n\n\n\n