We might have a little bit of different ideas about masks, and I don't really consider them to be necessary when outdoors (especially if no one is around) or if you are in your car by yourself, so I have seen people wearing masks in those circumstances, and just seems to be overkill to me, but of course a personal choice, and great that they have masks, and I understand that if someone just gets used to wearing a mask a lot of the time, then maybe they will fidget around less with it.
lotta cars have HEPA filters on the fresh air (cowl) intakes now. unsure what the rating is though.
check the manuals for your wheels.
and of course you need to know how to set the hvac controls correctly, including allowing for exhaust direction due to windows being open etc. rtfm dyor
maybe they are not enough, unsure but hey look it up for your make and model.