Pennsylvania radon action level 4

https://golf-wiki.win/index.php/What_Renters_and_Landlords_Need_to_Know_About_Radon_in_Rental_Properties

In Pennsylvania, the radon action level is set at 4 picocuries per liter (pCi/L) by the EPA, but local experts often suggest that homeowners consider mitigation if levels are above 2 pCi/L to be extra safe. This state has some of the highest radon risks in the U.S. due to its geology, so testing your home is a practical step—you can pick up a test kit at a hardware store or online. If results come back high, installing a mitigation system can reduce levels significantly, protecting your family…