Wikipedia has an article on:
Wikipedia has an article on:

COVID-19 is a nasty illness, caused by a virus named after a beer. The virus pretty much shut down the world in 2020 and 2021.


See wikipedia:FFP standards for more information about global standards.

There are different places selling "N95", "KN95" and "KF94" masks. In short, they all usually work better than pulling your shirt up over your nose.[1]