How is the smell in the library unlike the air anywhere else bub not buddy?

In "Bud, Not Buddy," the smell in the library is described as a unique blend of old books, wood, and dust, creating an atmosphere that feels both comforting and timeless. Unlike the outside air, which is often filled with the hustle and bustle of the world, the library’s scent evokes a sense of peace and refuge, inviting Bud to escape into the stories within its walls. This distinctive aroma symbolizes knowledge and imagination, setting the library apart from any other place he encounters.