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This report describes experiments conducted by CDC to assess two ways of improving the fit of medical procedure masks.
Making masks fit better can reduce coronavirus exposure by 96 percent
How well do face masks protect against COVID-19? - Mayo Clinic
Outward and inward protections of different mask designs for different respiratory activities
Reducing the Environmental Impact of Face Masks
PDF) An Added Benefit of Masks During the COVID-19 Pandemic: Ultraviolet Protection
COVID-19 false dichotomies and a comprehensive review of the evidence regarding public health, COVID-19 symptomatology, SARS-CoV-2 transmission, mask wearing, and reinfection, BMC Infectious Diseases
Performance Comparison of Single and Double Masks: Filtration Efficiencies, Breathing Resistance and CO2 Content
Polymers, Free Full-Text
Masks and Respirators
CDC urges that people double mask or to wear masks that fit - The