What substance do vehicles with an internal combustion engine release into the atmosphere through their exhaust?

Question

DentroTest · Accepted Answer

During the operation of heat engines or internal combustion engines (both diesel and gasoline), the fuel combines with the oxygen in the air to generate motive power. The unavoidable and most abundant residue of this chemical reaction is carbon dioxide (CO₂), together with water vapor and other pollutants in smaller proportions. CO₂ is the main greenhouse gas expelled through the exhaust pipe. By contrast, methane is not a characteristic gas in the exhaust of conventional vehicles, since its main origin is livestock farming and organic decomposition. For its part, natural gas is an alternative fuel source (made up mostly of methane) that powers certain adapted vehicles, but it is in no case the waste gas resulting from the combustion process.

What substance do vehicles with an internal combustion engine release into the atmosphere through their exhaust?

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