Good point Grandad, there's other situations also highlighted recently such as those who need to lipread being disadvantaged but I guess each situation which doesn't suit the one-size-fits-all will need to be dealt with individually.
I saw a woman the other day wearing a mask with her nose prominently stuck out over the top of it, and the other day was very glad of the plastic screens in the supermarket check out when the cashier had a fit of coughing, without covering her mouth!
A little tip for those wanting to get masks but struggling with availability; as a motorcycle rider, I already use what we refer to as buffs, ie neck tubes. I just use mine around my neck and pulled up over my mouth and nose, so just doing the same now and not pulling it down now when I get off the bike. They can be worn in a variety of other ways, including as a headband to cover roots awaiting the reopening of hairdressers (not a problem for me, my hair is white and doesn't need any touching in). I've just bought some new colourful ones, so suggest you look on eBay etc and do a search for biker neck tubes. I suggest you avoid the ones with skull or teeth in the designs, that is unless you like that sort of thing. And don't get the thermal ones, they'll be too hot for the summer, or the actual Buffet brand, as they're expensive. Hope this helps.