What happens when methane is burned when there isn't enough air?

When methane is burned in an environment with insufficient air, it undergoes incomplete combustion. This process results in the production of carbon monoxide, a toxic gas, along with carbon soot and other hydrocarbons, instead of the typical byproducts of complete combustion, which are carbon dioxide and water. Incomplete combustion is less efficient and can release harmful pollutants into the environment. Additionally, the flame may appear yellow or orange due to the presence of soot particles.