The Occupational Health & Safety Management System ISO 45001: 2018 controls the Means of Individual Protection (MIA), especially their mode of operation, their specifications, and the levels of security provided by each of them.
In the case of dispersal of Covid-19 in the workplace, the main PPE is the mask.
In the interactive illustration that follows, it seems that two types of masks work, respectively, those with cotton fiber knitting and those with synthetic fibers.
https://www.nytimes.com/interactive/2020/10/30/science/wear-mask-covid-particles-ul.html
Source: www.nytimes.com/interactive
