post the source of the info you are speaking on so i can understand what was said
heres my source for the image
Face coverings and mask to minimise droplet dispersion and aerosolisation: a video case study
https://www.google.com/amp/s/amp.cnn.com/cnn/2020/03/30/world/coronavirus-who-masks-recommendation-trnd/index.html
I want your honest opinion on why they said this.