https://www.fda.gov/medical-devices/emergency-situations-medical-devices/faqs-emergency-use-authorization-face-masks-non-surgical
Answers to frequently asked questions about emergency use authorization (EUAs) for face masks (non-surgical) issued by the FDA during the COVID-19 pandemic.
emergency use authorizationface masksfaqsnon
https://www.springerprofessional.de/en/experimental-comparison-of-cwa-17553-2020-community-face-coverin/19329326
With the worldwide spread of the COVID-19 virus in early 2020, shortages of surgical masks and filtering facepiece respirator (FFR) masks became a
face coveringsexperimentalcomparisoncwacommunity
https://www.businesstimes.com.sg/international/singapore-restarts-local-production-surgical-face-masks
SINGAPORE has restarted local production of surgical face masks since mid-February and is "on track" to meet all its healthcare workers' needs in the fight...
surgical face maskslocal productionsingaporerestartsbusiness