Abstract: An at least partially cooled product display cabinet in which cooling of the area or areas of the product display cabinet to be cooled takes place at least partially by means of a cooling air flow and/or by means of static cooling is described. According to the invention, at least one sensor (a, a?, a?, b, b?, b?, c, c?, c?, d, d?, d?) that is used to detect contaminants and/or particles of dirt in the cooling air flow is arranged in and/or on the product display cabinet. If the product display cabinet has at least one cooling air inlet area (5, 5?, 5?) and/or at least one cooling air outlet area (7, 7?, 7?) and/or at least one evaporator (8, 8?, 8?), the sensor or sensors (a, a?, a?, b, b?, b?, c, c?, c?, d, d?, d?) in the or a cooling air inlet area (5, 5?, 5?) and/or in the or a cooling air outlet area (7, 7?, 7?) and/or in the flow direction are located essentially directly upstream or downstream from the evaporator or evaporators (8, 8?, 8?).