Haven't seen it ever happen before. But this time is different. I am seeing almost no one without a mask outside.

It's not been a thing here except for pollution. Recent days lots of people have been wearing though, with current situation I expect it to increase.

A lot of them are wearing masks now. In point of fact, there was a shortage of masks in many cities until recently.

Nope, there is no such precedent.

No, but it has caught on a little