Device (1, 23) for simultaneously measuring an SO 2 concentration, an NO 2 concentration and an NO concentration in a gas mixture, comprising at least one measuring arrangement (2) with at least one measuring chamber (3) receiving a part of the gas mixture, wherein the measuring arrangement (2) for measuring the SO 2 concentration and the NO 2 concentration in the part of the gas mixture containing in the measuring chamber (3) is set up, characterized by at least one further measuring arrangement (9, 24) with at least one another part of the gas mixture receiving further measuring chamber (10), wherein the further measuring arrangement (9, 24) is arranged for measuring the NO concentration in the further measuring chamber (10) containing further part of the gas mixture.
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