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microenvironment

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n. ~ The physical conditions within a storage enclosure, especially as regards the interaction of trapped, still air immediately surrounding an object.

Notes: 

In the context of preservation, 'microenvironment' connotes the environment within an enclosure holding an item, such as a polyester sleeve, a CD jewel case, or a paper envelope. While such an enclosure can provide a barrier against external conditions, it can accelerate deterioration of the item by trapping undesirable chemicals in the item. For example, a polyester sleeve can capture and concentrate gases from a decomposing nitrate negative. Microenvironments are distinguished from microclimates, the latter describing physical conditions within an enclosed space that is significantly larger, such as a display case.