degradation/ˌdɛgrəˈdeɪʃən/ [deg-ruh-dey-shuhn]=the act of degrading
-Degradation is a concept in which the value of the biopysical environment is affected by one or more combination of human-induced processes acting upon the land.
ventilation[ven-tl-ey-shuhn]=the act of ventilating
-Outdoor air enters and leaves a house by: infiltration, natural ventilation, and mechanical ventilation.
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