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Isn't that in the stacks where the books are stored rather than in the reading rooms? I think @BringMeMyFix would know.
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Yes, stacks. I've been to the main repository at Boston Spa: all low oxygen, low temperature, massive computerised retrieval robot-ladder things. There are humans loading and unloading crates though. TBH, I think they'd still have more oxygen in that massive space than in a stuffy over-crowded reading room in the UCL building where I work. In the BeforeTimes, students were living in the library 24/7 in the run-up to exams, and I don't mind telling you, they fucking stank.
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
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.