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Table 2 Radon levels obtained from sampled offices in picocuries per liter (pCi/L)

From: Radon level in a Nigerian University Campus

Radon level/concentration(pCi/L) Number of offices %
≤2.7a (permissible level) 59 95.1
>2.7b (risky level) 2 3.2
≥4c (critical threshold) 1 1.6
Total 62 100
Median 0.9 pCi/L  
  1. Minimum value: 0.0 pCi/L, maximum value: 5.3 pCi/L
  2. aPermissible level: this is the indoor level recommended by WHO as a standard for countries to adopt
  3. bRisky level: radon values at this level pose some degree of risk
  4. cCritical threshold: this is dangerous level in which immediate action must be taken. Also known as the ‘Action level’