A good cellar is ventilated. A light stream of air will prevent excess moisture and fungal growth, but note that too much ventilation can affect the quality of your wine by creating large changes in temperature. Cellars are subject to temperature variations that can interfere with the aging process of wine. The ideal temperature is between 10 and 14 degrees Celsius, and it should be checked regularly. Good thermal insulation will help hold the temperature steady. The right humidity is close to 70%. Too wet, and you risk moldy corks; too dry, and corks may crack, bottles leak, and wines deteriorate. Wine should be stored in total darkness. Light rays degrade tannins and cause premature aging of wine. Corks are permeable, so wine comes in contact with the ambient air. Avoid storing products with strong smells, like paint and gasoline, to preserve the best flavors of the wine. Vibrations should be avoided (including those from nearby roads), since these may disturb the aging process of wine.