WHO Reference radon Level vs EPA Action Level

• WHO Reference Level: 2.7 pCi/L(100 Bq/m³). If this level cannot be reached due to country-specific conditions, WHO advises that the chosen threshold should not exceed 8 pCi/L(300 Bq/m³ ).

• U.S. EPA Action Level: 4.0 pCi/L (150 Bq/m³). The U.S. Environmental Protection Agency suggests considering fixing homes even between 2.0 and 4.0 pCi/L, noting there is no completely safe level of exposure.

• Below 2.0 pCi/L: Low levels, though no absolute safe threshold exists.

• 2.0 – 3.9 pCi/L: Moderate risk; the EPA suggests considering a fix, and the World Health Organization recommends action starting at 2.7 pCi/L.

• 4.0 pCi/L and above: High risk; official guidelines advise installing a radon mitigation system

https://blog.wenxuecity.com/myblog/65334/202608/1102.html

一方面打开地下室窗户，另一方面对地面的裂缝进行填补。