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Flue gas is a term frequently used to refer to exhaust gas, particularly in the context of combustion processes. It includes the byproducts of burning fuel that are discharged through a flue or chimney. This term is commonly associated with gases produced from industrial processes, power generation, or any system that involves burning fuels like coal, natural gas, or oil.

Using the term flue gas emphasizes the connection to the mechanisms involved in combustion and the need to manage emissions effectively, especially for environmental compliance and air quality control. Other terms listed, such as synthesis gas, carbon monoxide, and soot, refer to specific substances or byproducts that do not encompass the entire category of exhaust gases produced during combustion processes.