Direct answer
pCi/L is picocuries per liter, the US measurement of radon concentration. EPA action level is 4.0 pCi/L; the average indoor level is 1.3 pCi/L. (Europe uses Bq/m³; 1 pCi/L = 37 Bq/m³.)
Authoritative sources
- US EPA ↗
Cincinnati and surrounding counties sit in EPA Radon Zone 1, the highest-risk classification.
- EPA Citizen's Guide to Radon ↗
EPA recommends mitigation above 4.0 pCi/L and consideration of mitigation between 2.0 and 4.0 pCi/L.
- Ohio Department of Health ↗
Ohio Radon Program guidance on testing, mitigation, and contractor licensure.
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