Data: 07/08/2020
https://www.youtube.com/watch?v=iYE0A-5wd14
The three-layer fabric mask: research has shown that this combination of materials and layers provides a higher level of breathability and filter efficiency than one layer cotton masks. See what to look for whether you are buying a fabric mask or making one.
Idioma: Inglês Duração: 1 vídeo do youtube (0:59 min): son., color. Editor: World Health Organization
