IJERPH | Free Full-Text | Evaluation of Protection Level, Respiratory Safety, and Practical Aspects of Commercially Available Snorkel Masks as Personal Protection Devices Against Aerosolized Contaminants and SARS-CoV2
Maintenance free half mask - 4255+ - 3M
The World Needs Masks. China Makes Them, but Has Been Hoarding Them. - The New York Times