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

https://jeffreydhip475.image-perth.org/how-escondido-s-canyons-and-creeks-push-roof-rats-into-local-attics

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.