The main component of the Earth’s atmosphere that supports combustion is oxygen. Oxygen reacts with fuel during the combustion process to produce energy in the form of heat and light. Without sufficient oxygen, combustion cannot occur efficiently; hence, its availability is crucial for fire and energy production. In various settings, like engines or natural wildfires, the concentration of oxygen directly affects the intensity and duration of combustion. Understanding the role of oxygen in combustion is key for improving energy efficiency and reducing air pollution.