My hepa air purifier runs on an automatic setting for dust and odours. It never leaves its minimum setting when I'm using my ts55 or Festool sanders with a ct vac, ie the dust in the workshop is barely detectable. If I drop a pinch of sawdust in front of the sensor it switches to a higher fan setting. Similarly if I open a jar of shellac within seconds the fan increases.
So although I cannot tell you what the dust levels are, empirically I can tell you they are very low.