Returning to work (no more WFH)

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.