The subject research was carried out on apples of the variety "Gala Royal Beaut", "Zlatni Delišes", "Morrens Jonagored", "Granny Smith", "Cripps Pink (Pink Lady)", which were stored in chambers with a standard cooling system without the application of SmartFresh and in ULO regime with the SmartFresh application. The reference samples of apples were arranged in chambers, so that there was one variety in each chamber. Each chamber contained up to 150 T of apples. The ripening of the fruits was monitored at a storage temperature of 1.0°C to 2.5°C, depending on the variety, oxygen from 1.2% to 20.8% and CO2 at 0.9 to 2.0, while the relative humidity was from 90- 95%. Every other month, 30 apple fruits of all the listed varieties were used, from chambers with a standard system and from chambers that are in the ULO regime, and the firmness was measured using a penetrometer, sugars or the percentage of dry matter using a digital refractometer, a section of the fruit to determine whether there are any inside of the fruit some physiological changes during storage and changes on the skin of the fruit characteristic of a particular variety.