Study of the removal difference in indoor particulate matter and volatile organic compounds through the application of plants.

Environ Health Toxicol · 2017 · PMC5480428 · PMID 28231688

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a decreasing trendno p-value reported

It has also been observed that indoor concentrations of pollutants show a decreasing trend [ 12 ].

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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.