radon retest after mitigation 4

https://mycontinuousradonmonitorpro.summitviewdaily.com/posts/why-a-continuous-radon-monitor-gives-you-more-than-a-snapshot

After installing a radon mitigation system, it's crucial to retest the air to confirm it actually worked. Wait at least 24 hours, then run the test for 48 hours during normal living conditions. This ensures the levels have dropped below the EPA action limit of 4.0 pCi/L.