Gasification apparatus for generating a flammable product gas from a solid material, comprising: a gasification zone, into which the solid material can be filled via a solid material feed opening and from which solid material a pyrolysis gas is generated, an oxidation zone for the oxidation of the generated pyrolysis gas, which oxidation zone is connected to the gasification zone in order to conduct the pyrolysis gas generated in the gasification zone into the oxidation zone, characterised in that a first air feed device and a second air feed device (5; 6) feed air into the gasification zone, wherein the second air feed device (5; 6) is arranged downstream of the first air feed device in the processing direction of the solid material, a measuring unit (7; 10) for determining a measurement signal, which measuring unit is designed to determine a qualitative or quantitative amount of predetermined gas components of the flammable product gas and characterises this in the measurement signal, and a control device which is coupled in signal terms to the measuring unit (7; 10) for transmission of the measurement signal and is configured in such a way that it controls the amount of air that is to be fed in by the first and/or second air feed device (5; 6) as a function of the measurement signal, wherein the measuring unit (7; 10) is designed to determine directly or indirectly the tar content in the generated raw gas or product gas, and wherein the control device controls the amount of air that is fed in via the second air feed device (5; 6) as a function of the directly or indirectly determined tar content of the generated raw gas or product gas. a gasification zone, into which the solid material can be filled via a solid material feed opening and from which solid material a pyrolysis gas is generated, an oxidation zone for the oxidation of the generated pyrolysis gas, which oxidation zone is connected to the gasification zone in order to conduct the pyrolysis gas generated in the gasification zone into the oxidation zone, characterised in that a first air feed device and a second air feed device (5; 6) feed air into the gasification zone, wherein the second air feed device (5; 6) is arranged downstream of the first air feed device in the processing direction of the solid material, a measuring unit (7; 10) for determining a measurement signal, which measuring unit is designed to determine a qualitative or quantitative amount of predetermined gas components of the flammable product gas and characterises this in the measurement signal, and a control device which is coupled in signal terms to the measuring unit (7; 10) for transmission of the measurement signal and is configured in such a way that it controls the amount of air that is to be fed in by the first and/or second air feed device (5; 6) as a function of the measurement signal, wherein the measuring unit (7; 10) is designed to determine directly or indirectly the tar content in the generated raw gas or product gas, and wherein the control device controls the amount of air that is fed in via the second air feed device (5; 6) as a function of the directly or indirectly determined tar content of the generated raw gas or product gas.