radon retest after mitigation 3

https://theradontestingcompanyway.pinehavenscope.com/posts/why-choosing-the-right-radon-testing-company-matters-for-your-home

After installing a radon mitigation system, you typically wait a few days before retesting the air to make sure the system is working. Radon levels can fluctuate with weather and seasons, so the best time for a retest is during the heating season when windows stay closed. A simple short-term test kit placed in the lowest lived-in area will tell you if your efforts have brought radon down to safe levels.