Disposable masks release microplastics to the aqueous environment with exacerbation by natural weathering.

J Hazard Mater · 2021 · PMC8734940 · PMID 34015713

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an increasing trendno p-value reported

However, it is worth noting that there was an increasing trend when the particle size was higher than 400 μm.

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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.