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First, surgical masks (especially doubled up) work fine for keeping you safe from aerosols. Cloth masks also work to some extent, but not quite as much. This has been shown in a number of studies, but I'll link only a single recent one here that I think is well-performed. https://doi.org/10.4209/aaqr.210117 This is important to note, because it's a ...


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It would appear to be difficult to test this with a single direct experiment, but we can approximations based on aerosol transmission models. A recent paper, SARS-CoV-2 aerosol transmission in schools: the effectiveness of different interventions is the best attempt to do this I've seen so far. Here's an excerpt of their summary: Methods: We ...


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