Ole, I'm not sure how the lovin' is up there at the Arctic circle, but MY one night stands usually don't involve sniffing selenium toner!!!
Seriously, usually I have the windows open and I stand over the trays. This week I was tired and chose to sit, so my nose was about eight inches above the stuff. Yikes!
As for the mask, I am getting one for mixing of pyro. It would make sense to use it over the chemistry as well.