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In addition to controlling temperatures when handling fresh produce, control of the atmosphere is important
Some moisture is needed in the air to prevent dehydration during storage, but too much moisture can encourage growth of molds
Some commercial storage units have controlled atmospheres, with the levels of both carbon dioxide and moisture being regulated carefully
(Though living things emit carbon dioxide when they breathe, carbon dioxide is widely considered to be a pollutant
) Sometimes other gases, such as ethylene gas, may be introduced at controlled levels to help achieve optimal quality of bananas and other fresh produce
Related to the control of gases and moisture is the need for some circulation of air among the stored foods