Maybe. Is wearing a dust mask really so onerous to take out the probability factor?
Don't get me wrong. I'm not anally religious about dust mask wearing. But then, I'm in my mid-70's, and everything environmentally out to kill me has probably already had its opportunity. I'm not going to go overboard to possibly extend my already deteriorating life span and life quality for an unknown and uncertain amount of time if the means of doing so are too much of a PIA. Wearing a dust mask is not much of a PIA, IMO. It's obviously some kind of a trade-off involving personal risk factor weighting, health condition, and remaining life span. YMMV. Weigh all the pros and cons and make your own choice, and no need to apologize for intelligent and informed choices made thereby.