•    In indoor environments, ventilation by air supply without the use of a mixing fan does not ensure the well-mixed condition.
•    Ultrafine particle concentrations in indoor environments can be affected by human walking.
•    The importance of using the number-based concentrations to quantify the human walking-induced particle resuspension.
•    The hardwood flooring is associated with higher resuspension fractions compared to linoleum flooring.

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