I suppose fire risk isn't a huge deal if you're using portable breathing tanks, but you do still need to investigate health impacts.
Yeah, I'm well-aware of the dangers of oxygen fire (from learning about the Apollo program); oxygen tanks are probably how this would be implemented. Of course, I'm not sure that the benefit could possibly justify the expense of oxygen tanks but just the result would be interesting. (Perhaps one could justify some sort of oxygen alarm.)
Actually, I don't think oxygen tanks are that expensive relative to the potential gain. Assuming that the first result I found for a refillable oxygen tank system is a reasonable price, and conservatively assuming that it completely breaks down after 5 years, that's only $550 a year, which puts it within the range of "probably worthwhile for any office worker in the US" (assuming an average salary of $43k) if it confers a performance benefit greater than around 1.2% on average.
These tanks supposedly hold 90% pure oxygen, and are designed to be us...
If it's worth saying, but not worth its own post, even in Discussion, it goes here.