1. A method for providing a characteristic quantity for a state of an air system of a supercharged internal combustion engine for control of said engine, comprising: detecting, with the aid of a sensor, an air mass flow in the air system, wherein the air system has a throttle valve downstream from a compressor of a supercharger device; computing an air mass flow measured value from the sensor detected air mass flow; providing an air mass flow model for computing an air mass flow value of the air mass flow through the compressor on the basis of an air mass flow through the throttle valve, taking into account dynamic behavior of a volume between the compressor and the throttle valve; and providing air mass flow information on the basis of one of the air mass flow measured value or the air mass flow model value, as a function of a state of the air system.