That is sad to hear. I live in an area where almost no one wore masks. Even at the hight of the pandemic. Our local pharmacies got a bunch of N95s for free to give away free. There was supposed to be a limit but since no one was using them they would give me a lot of extra. I'm guessing they still have boxes stacked up somewhere.
Its also sad that this could have probably been prevented by using a wet saw with water hooked up. Anyone who has cut stone once without a wet saw walks away knowing they shouldn't have been breathing that.