Combustion products are the substances formed when a fuel undergoes combustion, a chemical reaction with oxygen. Common products include carbon dioxide, water vapor, and various pollutants like carbon monoxide and nitrogen oxides. The specific products depend on the type of fuel and the conditions of combustion. These products can have significant environmental and health impacts. For instance, while carbon dioxide is a natural part of the atmosphere, excessive amounts contribute to climate change. Meanwhile, pollutants like carbon monoxide can be harmful to human health, making it essential to manage and reduce emissions from combustion processes.