radon retest 3

https://radonretestden.scriblorax.com/posts/when-and-why-you-need-a-radon-retest-in-st.-louis

After initial mitigation, a radon retest is essential to confirm that levels have dropped below the EPA action limit. Usually done a few months after system installation, it helps ensure your family's ongoing safety from this radioactive gas. Skipping it can leave you unaware of recurring issues.