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

https://marcosgnc317.clearhavendigest.com/posts/what-proper-attic-decontamination-involves-after-a-rodent-infestation-2

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.