What is the EPA radon action level in picocuries?

The EPA radon action level is defined as 4 picocuries per liter of air. This threshold is established to help protect public health, particularly in residential environments, as radon exposure can lead to significant health risks, including lung cancer. When radon levels are at or exceed this action level, the EPA recommends taking steps to reduce radon concentrations in the home to minimize potential health risks. This guidance is grounded in various studies and data linking higher radon levels to increased cancer risk, reinforcing its importance as a regulatory standard for public safety.