Producer gas is a mixture of nitrogen and carbon (II) oxide.
Producer gas is a fuel gas that is produced by heating a carbon-based fuel with a limited amount of oxygen or air. This process, called gasification, produces a mixture of gases that are collectively known as producer gas. The primary components of producer gas are nitrogen, which makes up the majority of the gas, and carbon (II) oxide, which is the second most abundant component. Other minor components may include hydrogen, methane, and other gases, depending on the type of fuel and the gasification process used.
So, in summary, producer gas is mainly made up of nitrogen and carbon (II) oxide, with some minor amounts of other gases.