radon in crawl space 4

https://getradonfoundationaccesstoday.swiftnestly.com/posts/radon-foundation-access-why-it-matters-for-your-home-s-safety

Radon in crawl spaces is a serious concern since this radioactive gas seeps in through soil and foundation gaps, concentrating in unventilated areas. Testing is the only way to know levels, and mitigation often involves sealing entry points and installing a sub-slab depressurization system to vent gas safely above the roofline.