What is the main source of sulfur dioxide in the atmosphere?

The main source of sulfur dioxide in the atmosphere is indeed the combustion of fossil fuels containing sulfur compounds. This process occurs when fuels such as coal, oil, and natural gas, which often contain sulfur, are burned for energy in power plants, vehicles, and industrial processes. During combustion, sulfur in the fuel reacts with oxygen to form sulfur dioxide, which is released into the atmosphere as a pollutant.

This emission contributes to air quality issues and can lead to the formation of acid rain, impacting ecosystems, human health, and built environments. In contrast, the decomposition of vegetation primarily produces carbon dioxide and other organic compounds, while the complete combustion of carbon-containing fuels mainly results in carbon dioxide and water, not sulfur dioxide. Additionally, the respiration of living organisms releases carbon dioxide and consumes oxygen but does not significantly contribute to sulfur dioxide levels in the atmosphere.