Combustion gases are the byproducts produced when a fuel, such as natural gas or wood, undergoes a chemical reaction with oxygen during burning. This process releases energy in the form of heat and light, while generating gases like carbon dioxide, water vapor, and sometimes carbon monoxide and nitrogen oxides. These gases can vary in composition depending on the type of fuel and the conditions of combustion. Proper ventilation is essential to disperse combustion gases, as some, like carbon monoxide, can be harmful or even fatal in high concentrations. Understanding combustion gases is important for safety and environmental considerations.