Me?
I’ve only ever used it once, on a domestic job, don’t rate it and much prefer hypo.
As I said, I’ve never seen Benz use a mask and they are big players in it. They’ve even got videos on YouTube spraying the biocide (DDAC) and no mask in site.
On the softwahs website, there DDAC sds sheet states inhalation as precautionary risk.
It is really getting the stuff actually in your mouth/on your skin that’s the issue.
Each to their own.