> I think you're moving the goalposts. You invoked deaths directly attributable to industrial process.

Directly or indirectly, industrial processes are always going to be somewhat dangerous. TFA is discussing indirect deaths due to formaldehyde.

> Are there recorded deaths from long term wearing of a positive pressure suit?

Not that I know about, but then again I wouldn't be surprised if there were deaths due to equipment failure and suffocation. The materials used in them certainly contain various low level carcinogens.

> And why exactly would that be "somewhat" toxic? Is it "somewhat" lethal then?

Point is it's balancing risks. It isn't lethal directly at levels used in many industrial processes, but exposure over a long time does increase cancer risk and fatality risk. Then again so do many other common materials.