The gas produced as a result of combustion is primarily carbon dioxide (CO₂), along with water vapor and other byproducts depending on the fuel used. In a combustion reaction, organic materials react with oxygen, releasing energy in the form of heat and light. If the fuel combusts completely, only CO₂ and H₂O are formed, which is considered a clean combustion. However, incomplete combustion can generate harmful pollutants like carbon monoxide and soot, impacting air quality and human health.