Abstract: System for controlling the air composition within a storage room for breathing vegetable products. The storage room is connected to elements for controlling the oxygen content of the atmosphere in the storage room and comprises one or more sensors for sensing the air composition in the storage room. A processor is available for receiving the sensor signals and supplying control signals to oxygen content controlling elements. Furthermore the storage room comprises sensors for determining the development of metabolites in the vegetable products at the transfer of normal breathing to fermentation. The processor based on the signals, delivered by the sensors, controls the oxygen content controlling elements such that the vegetable products are stored in an air composition in which the oxygen contents is as low as possible without fermentation occurring.