Gas sensor system

The gas sensor system for detecting at least one present in the ambient gas or particles, or both, wherein the gas sensor system contains at least two sensors in combination, of which one is a scattered light sensor (11), and a circuit (20) for operating the sensor system, characterized in that the gas sensor system of the scattered-light sensor (11) or the scattered-light sensor (11) and a gas sensor (19) and a Oberflachenionisationssensor (12, 13) includes an infrared emitter (12) for ionization of the gas to be detected, wherein the Oberflachenionisationssensor ( 12, 13) comprises a (in a short spaced .DELTA.I) (in front of the infrared emitter 12) electrode (13) for measuring the ionization current, which (for the infrared radiation of the infrared emitter 12) is at least partially transparent and in the path of the infrared radiation to an absorption path (14), and wherein said scattered-light sensor (11) is arranged such that from the Infrared emitter (12) emitted radiation is scattered at the particles to be detected in the absorption path (14) and of the scattered-light sensor (11) detectable ...