PA DEP radon standards 2

https://crawlspaceradonsealingpulse.brightpathdigest.com/posts/sealing-your-crawl-space-for-radon-protection-a-practical-guide

PA DEP radon standards set the acceptable levels of radon gas in Pennsylvania homes and buildings. The Department of Environmental Protection recommends action when radon levels hit 4 pCi/L or higher, as long-term exposure can cause lung cancer. These guidelines help keep indoor air safe and healthy across the state.