What is the most common Radon Action Level recommended?

The recommended Radon Action Level is established based on health risk assessments and scientific studies indicating the potential dangers of radon exposure. The most common standard set by health authorities, including the U.S. Environmental Protection Agency (EPA), is 200 Bq/m3 (or about 4 pCi/L). This level represents a threshold above which action is advisable to reduce exposure and mitigate health risks associated with radon, a known carcinogen.

At this level, it's recommended that homeowners consider taking corrective action to lower radon levels, such as improving ventilation or installing mitigation systems. The base for this recommendation is rooted in evidence linking elevated radon levels to an increased risk of lung cancer, especially among smokers. Recognizing this, the 200 Bq/m3 action level functions as a guideline to enhance public health safety and awareness concerning radon mitigation.