My PB for putting on a mask to hyperventilating is 45 seconds. It only takes a few inadequate deep breaths due to the stuffy humidity and there I am overheating, shucking clothes, before yanking the bloody thing off my face and breathing lots of aerosol from deep within my lungs.
So it's better for me and those in the vincinity not to attempt it.
I wear a visor in shops, but that is a stupid gesture for 20 minutes outdoors on a windswept playground when all it will do is fog up and obscure my vision creating a trip hazard. So again, it's safer not to play stupid games for the sake of looking like you're doing something.
This morning, there were 3 of us loitering on the playground between staggered drop-offs. How hazardous!
I had to sign DS1 out immediately for an appointment, go round to the small lobby/ reception. "One person at a time" fair enough. You can't stand 2m apart in there. I'm person #1. I stand back from the hatch as much as is feasible. Despite their masks, there are 2 other sets of people crowded in a space that can only accommodate 1. Masks give a false sense of security. I don't wear one, but I'm much more mindful about space than the people who think they're invincible by covering their airways with some scraps of fabric.
School is aware of DS1's developmental conditions that make him reasonably exempt (plus communicating with him is also reasonable on my part) and they are also aware of DS2's health condition that makes him reasonably exempt. It does not take a leap of imagination to realise that their parent may indeed have issues about it themself.
Anyway masks outside are pointless at best.