Arrangement for the aftertreatment of exhaust gases

An arrangement for the aftertreatment of exhaust gases from a compression-ignition internal combustion engine with an exhaust gas collecting system (1) in which a reducing catalytic converter (2) is arranged for the reduction of NO.sub.x components of the exhaust gas from the internal combustion engine, comprising a metering device, said metering device comprising an electrically controlled metering valve (6) for a metered introduction of a reducing agent into a flow of the exhaust gas fed to the catalytic converter (2) as a function of engine operating values, stored in a characteristic map, for the NO.sub.x content of the exhaust gas given various operating parameters of the internal combustion engine and of the catalytic converter, and further comprising an air supply, controlled by a valve (5), from a compressed-air source (18), by means of the air supply the quantities of reducing agent emerging at an outlet end (36) of the electrically controlled metering valve (6) are fed to the exhaust gas finely dispersed in air, wherein the valve for controlling the air supply is an electrically controlled valve (5) which has an outlet opening (26) arranged downstream of the outlet opening of the metering valve (6) and the outlet opening (26) opens directly into the exhaust gas of the internal combustion engine.