/Docs/G/Org-IAEA-Safety-GSR3-CmA/Sec/5_Existing_0.md
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Establishing an appropriate reference level for ²²²Rn for dwellings and other buildings with high occupancy factors for members of the public, with account taken of the prevailing social and economic circumstances, that in general will not exceed an annual average activity concentration due to ²²²Rn of 300 Bq/m^{3 55};