At a single home in Blowing Rock, one radon monitor took 1,440 radon readings over a recent 60-day period.
There were two-day windows where a traditional short-term test would have returned a reading as low as 12.1 pCi/L (3x the EPA recommended action level). But there were also two-day windows where levels hit 95.2 pCi/L (24x the action level), driven by dropping barometric pressure and temperature differentials, pulling radon up in ways a point-in-time test would never capture.
A short-term test doesn't measure the radon level you are experiencing. It measures your radon level at a certain location on the days you happened to test. Depending on when and where you placed that test kit, you could walk away falsely reassured.
Continuous data removes the lottery. Instead of a single snapshot, you see the full range your home experiences — and you get an alert when it matters, not a result weeks later.
Recommendations
1. provide data and discuss radon mitigation with qualified professional
2. install continuous radon monitoring on all levels
3. monitor the power on the radon fan to ensure it continues to operate as expected