Around here, all libraries smelled of acid based paper, read that as paper mill smell that was old but still pungent, and vomit. What did janitors back in the day use to clean up vomit? Something that also smelled of vomit. It wasn't until my later teen years that they pulled up the vomit carpet that was laid down over the hardwood floors in the early 60's. This really helped with the smell but there was still all that old acid based paper. It was about late 90's early 2000's that they did a total remodel, reconstruction of the Greenville Public Library and this included the children's branch. Haz-Mat was there for the collection of asbestos but there was also mold in most of the walls and support structures that were covered with plaster.
Up until the last couple years, I could always tell the day they started airing out the schools from the Summer months. The air would be filled with the smell of old books and vomit. This has been happening less as every year they find a ton of mold somewhere and then they teardown and sterilize.