radon measurement 3

https://radongastestreport.silverstonebrief.com/posts/when-to-schedule-a-radon-gas-test-in-st.-louis-a-practical-guide-for-homeowners

We decided to test our basement for radon after hearing it's the second leading cause of lung cancer. The kit was easy to use—just left it open for a few days, then mailed it in. I was relieved our levels were low, but I'm glad we checked. It's one of those things that's invisible and odorless, so you'd never know it's there without measuring.