The whole point of gasification is the production of syngas. You don't vent syngas to the atmosphere for the same reason you don't pour gas on the ground. Burni

The whole point of gasification is the production of syngas. You don't vent syngas to the atmosphere for the same reason you don't pour gas on the ground. Burning syngas doesn't have to emit carbon monoxide, a catalytic converter like on almost every car out there would work just the same to clean up the emissions.