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https://wouterdeheij.com/2020/05/01/about-the-sick-building-syndrome-aerosols-and-why-we-should-not-just-put-maurice-de-hond-as-a-crazy-one-the-advice-could-also-be-go-outside-with-your-family-and-dont-sit-inside-with-large-groups/
About the Sick-Building syndrome, aerosols and why we should not just put Maurice de Hond as a crazy one. The advice could also be: go outside with your family, and don't sit inside with large groups of people you don't know and make noise, especially if this group of people are indoors