If you’re selling your home, it’s a good idea to test it for radon before you put it on the market. That way, if your test reveals elevated levels of radon, you can take care of it before scaring off potential buyers. Be prepared to share test results and any mitigation efforts.
The EPA recommends that to improve indoor air quality, people should consider installing a mitigation system to reduce radon levels below 2.0. While 4.0 is the number that triggers seller action (usually), the lower the radon, the less cumulative impact on health.