Galvanized steel, Stainless steel and Aluminium are all bad for your health.
Even though I have a well vented work space I am still installing a fume & particle extraction system. If your space has a low ceiling like mine than you require an extraction system that removes the fumes & particles from two different locations. The particles from the arc level and the fumes above your head. That way there is only clean air below your nose.
Fumes are not just smoke but toxic gases including the shielding gas.
I am currently testing the amount of suction power required to extract particles, but with any new product there is always welding. I started welding a holding arm for the suction nozzle. It will sit up in the portal frame of my bay when not in use.