Characterizing the Indoor-Outdoor Relationship of Fine Particulate Matter in Non-Heating Season for Urban Residences in Beijing.

PLoS One · 2015 · PMC4580321 · PMID 26397734

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may be significantno p-value reported

On the other hand, there may be significant sink of infiltrated ambient PM 2.5 in the indoor spaces.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.