It doesn’t seem to bother anyone, except maybe foreigners, to see people wearing these masks. People even wear them for group pictures.
I don’t know if the people who wear them are sick and trying not to pass on germs, or if they are healthy and don’t want to get germs, or if they are trying to filter out the cigarette smoke, or if this is a fashion statement, or if they are traveling in congnito. Or maybe all of the above.
This is another mystery in Hokkaido.