radon in attached houses 3

https://yorkparadonguideinsider.stonefielddigest.com/posts/a-practical-york-pa-radon-guide-for-homeowners-and-renters

Radon in attached houses can be tricky because the gas seeps through shared walls and foundations, not just from the soil below. If your neighbor has high levels, yours might too, even with modern insulation. Testing both units separately is smart—radon moves unpredictably through connected spaces, and a single reading won't tell you the whole story.