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I'm going to suggest that's a bit fanciful, without doing any looking into it. I mean - how, for a start. And HSE are ok with it?
NotThamesWater-
Done the google, though quickly, and can confirm reduced oxygen levels at long term storage facilities
https://www.ifla.org/wp-content/uploads/2019/05/assets/pac/British-Library-low-oxygen-case-study.pdf
From a post about another library
MYTH: The library’s fire-extinguishing system removes the air from the book stacks in the event of a conflagration, dooming any librarians inside to a slow death by asphyxiation.
MOSTLY FALSE: According to Jones, this legend has a kernel of truth:
Instead of water sprinklers that would harm the rare books
collections, he said, a combination of halon and Inergen gases would
be pumped into the stacks to stop the combustion process, and thus the
spread of fire.“They do lower the percentage of oxygen, but not enough to kill any
librarians,” Jones said.https://yaledailynews.com/blog/2010/02/04/myths-abound-about-beinecke/
So true for the long term storage areas, but not for the open to public areas afaik. Carry on.
kboy
I've spent days working there and it's a nice place but I always struggled with focus. Mentioned it to a friend who explained why. As a protection against fire they lower the oxygen levels in the air so no wonder I got tired.