If everyone wears masks that reduce droplet exhalation, that helps, even if a mask didn’t help prevent inhalation of droplets. I chose the words “droplet transmission” carefully.
> less than 50% wear them.
I looked a photo taken in Japan today - certainly looks like more than 50% to me - but hard to get facts on and I only looked at the first photo I could find.
> The majority of people wearing masks in Japan are for hay fever.
I.e. the mask is worn to reduce inhalation of small particles: surely you are contradicting yourself (you say they “seal nowhere” you are implying that they have no effect and that anyone using one for hayfever is mistaken).
