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The use of facial masks played a pivotal role in combating COVID-19 duringthe pandemic period, particularly in the absence of vaccines for the disease.This study elucidates how this type of equipment can effectively containviruses and bacteria of nanometric dimensions, smaller than the pores of themasks themselves. To achieve this, three types of masks were chosen: cloth,surgical, and PFF2 masks. In order to compare the structure of each, a scanningelectron microscopy analysis was conducted, revealing the intricate filtrationlayers within each mask type.

Como o Uso de M\'ascaras Ajudou no Combate a COVID Durante a Pandemia  nos Anos de 2020-2022. An\'alise Comparativa da Estrutura de Filtragem das  M\'ascaras