I don’t really like giving out healthcare advice on the Internet. But also... I feel bad for folks being harmed. I’m an amateur woodworker and a non-amateur medical professional, so I’ve looked into this topic for my own self. Putting on the n95 while you’re sanding isn’t sufficient in that sort of environment.

But I’d really rather you didn’t take my word for it: perhaps you’d consider reaching out to a pulmonologist with experience in carpenters’ occupational lung diseases, and get their take on it?

Spoken, honestly, as one stranger wishing another no harm.