What type of combustion primarily leads to the release of sulfur dioxide?

The release of sulfur dioxide is primarily associated with fossil fuel combustion. Fossil fuels, such as coal, oil, and natural gas, often contain sulfur compounds. When these fuels are burned during combustion, the sulfur oxidizes to form sulfur dioxide gas, which contributes to air pollution and can lead to acid rain.

This process is particularly significant in power plants and engines that rely on fossil fuels for energy. The combustion of these fuels is a common source of sulfur dioxide emissions in industrial settings and urban environments. Understanding this relationship is crucial for addressing environmental issues related to air quality and the impacts of fossil fuel usage.