•    A single-blinded cross-over study was conducted in 20 urban residences in China.
•    Efficiencies of HEPA air cleaners at reducing indoor particles were evaluated.
•    Particle-reduction efficiency was ∼40% over 48 h under normal living conditions.
•    Particle-reduction efficiency had a significant association with the room volume.
•    Residences with large rooms should use multiple cleaners to achieve healthy air.



Credit: iStock, Qwart

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