The United States has a radon guideline of 4 pCi/L (equal to approx. 150 Bq/m3). Canada recently lowered it’s action level to 200 Bq/m3. Australia, Sweden, Ireland, and the UK also use 200 Bq/m3. It would be most unlikely for the EPA to raise their recommended action level from 4 pCi/L to 5.4 pCi/L. The W.H.O. recommends that radon levels be reduced to less than 100 Bq/m3 (equivalent to about 2.7 pCi/L).
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