nonoccupancy

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On the other hand, the effect of occupancy periods on the fine particles in this study might be explained by the fact that the students sometimes opened the windows when they were in the classroom, which led to an increase in air change with the outdoor air and a possible increase in the concentrations of fine particle (<1 [micro]m) in the classroom, hence an increase in the levels of these size classes during occupancy and, therefore, an increase in the occupancy to nonoccupancy ratios.
When particle size range increases, the occupancy and nonoccupancy ratio increases as well.
10] was very clear; the difference between occupancy and nonoccupancy periods was significant, which was about six times higher than when the classroom was unoccupied.
71) during nonoccupancy, sitting, and walking periods, respectively, when all windows and the windcatcher were closed.