The following paper was recently published: Z. Wang, C. An, X. Chen, K. Lee, B. Zhang, and Q. Feng, Disposable Masks Release Microplastics to the Aqueous Environment with Exacerbation by Natural Weathering, Journal of Hazardous Materials (Elsevier), 417, 126036 (2021).

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https://www.sciencedirect.com/science/article/abs/pii/S0304389421010001