radon in old rowhouses 3

https://wiki-room.win/index.php/Understanding_Codorus_Creek_Radon_Concerns_in_York_County

Radon in old rowhouses can be a real concern, since these historic buildings often have basements or crawl spaces with cracks in the foundation or gaps around pipes where the gas can seep up from the soil. Because radon is invisible and odorless, many homeowners don't realize they might be breathing it in until it's too late. If you live in an older rowhouse, it's wise to test for radon levels, especially in lower levels where the gas can accumulate. Simple test kits are available, and remediat…