ultraviolet light if they contain SARS-CoV-2 when the filter is taken out and sprayed with a fluorescent dye that contains antibodies from ostrich eggs. Other research investigated environmental pollution associated with face mask waste management and weak spots of masks with product designs of the widely applied FFP standards, in particular variants with exhalation valves. Regulation In the United States, surgical masks are cleared for marketing by the U.S. Food and Drug Administration. In the European Economic Area (EEA), surgical masks have to be certified through the CE marking process in order to be commercialized. CE marking of surgical masks involves the respect of many obligations indicated in the Medical Device Regulation (Council Regulation 2017/745 of 5 April 2017 concerning medical devices, OJ No L 117/1 of 2017-05-05). Surgical masks for use in the US and the EEA conform to ASTM F2100 and EN 14683 respectively. In both standards, a mask must have a Bacterial Filtration Efficiency (BFE) of more than 95%, for an aerosol of particles of size approximately 3.0 μm. In China, two types of masks are common: surgical masks that conform to YY 0469 standard (BFE ≥ 95%, PFE ≥ 30%, splash resistance) and single-use medical masks that conform to YY/T 0969 standard (BFE ≥ 95%). Daily protective masks conforming to GB/T 32610 standard is yet another type of masks that can have similar appearance to surgical masks. See also Dust mask Nose filter Sterilization (microbiology) References External links Filtering out confusion. Frequently Asked Questions about Respiratory Protection, National Institute for Occupational Safety and Health Coronavirus disease (COVID-19) advice for the public: When and how to use masks 1960s introductions East Asian culture Japanese culture Medical hygiene Medical devices Occupational safety and health