Depends on the purpose of the mask. N95 type masks are for preventing the wearer from getting the virus. Regular surgical and cloth-type masks are for preventing the wearer from transmitting the virus to others. Both are far better than nothing for their respective purposes, but the cloth masks are fairly useless for the purpose of protecting the wearer. Research has already established that people can carry and transmit the virus without displaying any symptoms. So if you happen to be visiting the Mayo Clinic and all the doctors, nurses, patients and other visitors are ALL wearing masks, and the rule is to wear a mask, PUT ON YOUR DAMN MASK!!!!
Bill, tgo