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Canada recently lowered it’s action level to 200 Bq/m3 (equal to 5.4 pCi/L). Presently Australia, Ireland, Sweden and the UK also use 200 Bq/m3 as the recommended action level. It is highly unlikely that the US EPA will raise the recommended action level from it’s present 4.0 pCi/l level (150Bq/m3) to 5.4 pCi/L.
