A dirty crawl space should not be ignored, since rodent droppings, urine

https://keegansixt891.evergrovio.com/posts/why-you-need-to-clean-your-crawl-space-right-now-2

A dirty crawl space should not be ignored, since rodent droppings, urine, and nesting debris are biological contaminants that can affect the air inside your home.