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radon retest after repair 4

https://subslabdepressurizationtimes.valiantfield.com/posts/understanding-sub-slab-depressurization-for-radon-mitigation-in-st.-louis

After installing a radon mitigation system, it's crucial to retest your home to ensure the levels dropped below the action limit. Wait at least 48 hours after turning on the fan, and run the test for a minimum of two days during normal living conditions. If the radon still tests high, you may need to adjust the system or add a sealant around foundation cracks.

radon in basement 4

https://radonmeasurementdeck.valiantfield.com/posts/why-accurate-radon-measurement-matters-for-st.-louis-homeowners

Radon in basement is a serious concern because this radioactive gas seeps up from the soil and can accumulate without you even noticing. I had a neighbor who tested his and found levels were way above the safe limit. Since you can't see or smell radon, the only way to know is to buy a test kit or hire a professional. If it's high, mitigation systems can vent the gas outside and make the basement safe again. It's definitely worth checking if you spend time down there.