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. 2022 Jul 18;13(8):101510. doi: 10.1016/j.apr.2022.101510

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Fig. 3 — Transboundary impacts on PM_2.5 concentration and source contributions in Seoul during the early stage of the COVID-19 outbreak in China. (a) Minimum effect (episode 1, left panel). (b) Maximum effect (episode 2, right panel).