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

https://judahojly160.dovetailscope.com/posts/the-best-materials-for-permanent-rodent-exclusion-in-san-diego-homes

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.