I’m pretty sure none of them wore masks when doing this. I honestly didn’t think to wear a mask either (since they weren’t and never really even warned us how bad it would be), but fortunately we were behind closed doors most of the time the particles were in the air.
Fortunately it was a granite countertop and not quartz. But I still can’t imagine that stuff is good to breathe on a recurring basis, and it still amazes me that they were fairly casual about the whole thing.
My guess is the industry just isn’t educating workers about the risks.