Is it true or false that there are no health risks if Radon concentrations are below 4 pCi/L?

• A. True
• B. False
• C. Depends on exposure duration
• D. Not enough data

Answer: (B)

The statement that there are no health risks if Radon concentrations are below 4 pCi/L is false. While it is true that the U.S. Environmental Protection Agency (EPA) recommends taking action to reduce radon levels in homes if concentrations are 4 pCi/L or higher, research indicates that even lower levels of radon can pose health risks.

Radon is a known carcinogen, and there is no established threshold below which exposure is entirely risk-free. Studies have shown that long-term exposure to radon, even at levels below 4 pCi/L, can still contribute to the risk of lung cancer over time, especially for individuals who smoke or have other risk factors.

Therefore, while the highest concern is associated with levels above 4 pCi/L, the idea that levels below this threshold carry no risk does not reflect the current understanding of radon exposure and its health implications. This underscores the necessity for continuous monitoring and potential mitigation, even at lower levels, to safeguard against long-term health risks.