Crawl space rodents can affect the air inside your home because contaminated droppings, urine

https://gregorybjcv091.urbanvellum.com/posts/what-proper-attic-decontamination-involves-after-a-rodent-infestation

Crawl space rodents can affect the air inside your home because contaminated droppings, urine, and nesting materials may create particles people can breathe if the area is disturbed.