long-term radon test 4

https://myradontestingcompanyhaven.scriblorax.com/posts/why-you-should-hire-a-radon-testing-company-before-buying-a-home-in-st.-louis

A long-term radon test involves placing a small detector in your home for at least 90 days to measure average radioactive gas levels, giving a more accurate picture of your year-round exposure than short-term tests due to seasonal and daily fluctuations.