I would wear a mask under three situations, and I would do so, particularly at this point when the epidemic is clearly significant and rising.
And the first is in any situation which was indoors and crowded, or indoors with close proximity to other people and that is because masks help protect other people – this is a thing we do to protect other people, this is by far its principal aim.
The second situation I’d do it is if I was required to by any competent authority. I would have no hesitation about doing that and I would consider that was a reasonable and sensible thing if they had good reason to do that.
And the third reason is if someone else was uncomfortable if I did not wear a mask, as a point of common courtesy of course I would wear a mask so under all those circumstances I would do so.