In Pennsylvania, the radon action level is set at 4 picocuries per liter by the EPA, meaning that if your home's test shows levels at or above this threshold, it's strongly recommended to take steps like installing a mitigation system to reduce radon exposure. This isn't just a guideline—it's a health benchmark based on studies linking long-term radon exposure to increased lung cancer risk. Many homes in the state, especially those with basements or well water, may need periodic testing to ensu… Pennsylvania radon action level 10