Pulling the mask up and down is unsafe for several reasons. First of all, you touch your face. Chinese scientists insist on fomite transmission being real. Seco

Pulling the mask up and down is unsafe for several reasons. First of all, you touch your face. Chinese scientists insist on fomite transmission being real. Second, more importantly, you need your mask tightly fit, to protect others. If you keep fiddling with it, moving up and down, it wont be tight after second or third time you do this. And from the social point of view it is just a bad signal. Period.