Michigan Residential Builders License Practice Test

What is the EPA's "Take Action Level" for radon exposure?

1. 2 PCI/L

2. 4 PCI/L

3. 6 PCI/L

4. 8 PCI/L

The correct answer is: 4 PCI/L

The EPA's "Take Action Level" for radon exposure is set at 4 picocuries per liter (pCi/L). This level indicates the concentration of radon gas in the air that, if exceeded, warrants immediate action to reduce radon levels in the home or building. The basis for establishing this threshold is derived from extensive research linking elevated radon exposure to increased risk of lung cancer. At levels above 4 pCi/L, the EPA recommends homeowners take measures such as radon testing and mitigation to lower the concentration of radon. This level is a critical standard for ensuring health safety, as it reflects a balance between risk and practical intervention methods. By adhering to this guideline, property owners can significantly decrease potential health risks associated with radon exposure, promoting safer living environments.