radon in new homes

https://high-wiki.win/index.php/Radon_Pros_York_PA_Expands_Testing_and_Mitigation_Services_Across_South_Central_Pennsylvania

Many homeowners don't realize radon can seep into new houses through foundation cracks and gaps around pipes. Unlike older buildings, modern airtight construction can actually trap this radioactive gas inside. Testing right after move-in is smart—cheap kits are available at hardware stores. If levels are high, a simple vent system fixes it before it becomes a health hazard.