Excerpts from the report: Modification and control of the atmosphere in fruit storage plants is a method used increasingly in recent years to hold the condition and extend the storage life of fruit, especially apples. This is in addition to the maintenance of artificially cooled temperatures and high relative humidity, basis requirements for regular cold storage. For apples in CA storage, levels of 2 to 3 percent oxygen and 1 to 7 percent carbon dioxide together with the appropriate minimum temperature, usually 30 to 38 degrees (depending on the variety), and 95 percent relative humidity, are the most satisfactory for minimizing respiration and the ripening process. Each apple variety differs slightly in requirements for oxygen and carbon dioxide, temperature, and relative humidity for optimum results.