Carbonyl sulfide (COS) is a sulfur-containing compound that plays a crucial role in atmospheric chemistry. It is released into the atmosphere through both natural processes, such as volcanic activity and oceanic emissions, and anthropogenic activities, such as combustion of fossil fuels and biomass burning. Research on carbonyl sulfide focuses on understanding its sources, sinks, and atmospheric transformations, as well as its role in the global sulfur cycle. COS is of particular interest because it is the most abundant sulfur-containing compound in the atmosphere and serves as a major source of sulfur to the stratosphere, where it can contribute to the formation of sulfate aerosols. Additionally, COS is also being studied as a potential tracer for carbon uptake by plants through photosynthesis, as it is taken up by plants in a similar manner as carbon dioxide. This has led to a growing interest in using COS measurements as a way to better understand carbon cycling in ecosystems. Overall, research on carbonyl sulfide helps improve our understanding of the complex interactions between sulfur, carbon, and other elements in the atmosphere, and its implications for climate change and air quality.