KN95 respiratory masks are masks that are regulated by the Chinese government under regulations GB 2626-2006. They are supposed to provide 95% protection against all particles that are greater than 0.3μm in diameter. These masks have become generally available to larger masses in April, 2020, to help the Chinese people, as well as other countries, fight the COVID-19 pandemic. They can be worn by key workers who interact with patients, but may also benefit individual members of the public who want an extra level of protection in place when they visit the local supermarket or pharmacy to pick up supplies.
As with all types of PPE equipment, you may choose to wear your KN95 masks as a single item of defence. Alternatively, you can wear it with other pieces of personal protective equipment for a multi-layered way to safeguard your health and to reduce the transmission risk of COVID-19 or other airborne viruses. KN95 masks are often worn in combination with protective face shields.