Lots of bad fumes and dust.
Can’t recall where I saw it, but I have run across a welding helmet that doubled as a respirator for exactly those conditions. Looked kinda like a full-face respirator only with a permanent clear plastic front and a welding mask that was in front of that and could be flipped up. Capable of working with beards, positive-pressure so no shroud needed over the nose and mouth that would otherwise muffle the voice.
Now granted: stupidly expensive. But the filter was on the helmet, not on the back or the waist (no hoses to get in the way). And it had a normal power-tool battery slot with adapters for the common ones like Milwaukee or Bosch.






No, we aren’t. We are just suffering from regulatory capture and really, really wealthy home builders that buy up local politicians like they’re penny stocks.
We desperately need to import the Vienna Model, but then those brainwashed by Cold War era shite will start screaming “communism!!1!”