Abstract: The invention relates to a method for determining a concentration of at least one component of gas present in a gas line or in a gas container, wherein gas is led off from the gas line or the gas container at a measurement location and is supplied to at least one gas flame; the ion flow is measured between a gas flame to which gas is supplied and an electrode arrangement; the temperature of a gas flame is measured to which gas is supplied; and the concentration of the at least one component of the gas present in the gas line or in the gas container is determined from the measurement ion flow and the measured temperature or from values related thereto. The invention furthermore relates to gas concentration sensors for carrying out the method in accordance with the invention.