Countries around the world are facing shortage of face masks, particularly the N95 ones, post the COVID-19 outbreak. Hence, leading health organisations like the Centers for Disease Control and Prevention (CDC) does not recommend N95 masks or N95 respirators for use by the general public. The CDC noted in its guidelines that N95 masks are critical supplies that must be reserved for health care workers and other medical first responders to protect themselves from the respiratory disease. Recently, the federal government announced the import of a large number of KN95 masks from China. People might ask " Is a KN95 respirator...