/Docs/G/Org-IAEA-Safety-GSR3-CmA/Sec/5_Existing_0.md
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Where activity concentrations of radon that are of concern for public health are identified on the basis of the information gathered as required in para. 5.19(a), the government shall ensure that an action plan is established comprising coordinated actions to reduce activity concentrations of radon in existing buildings and in future buildings, which includes⁵⁴:

1. 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};
2. Reducing activity concentrations of ²²²Rn and consequent exposures to levels at which protection is optimized;
3. Giving priority to actions to reduce activity concentrations of ²²²Rn in those situations for which such action is likely to be most effective⁵⁶;
4. Including in building codes appropriate preventive measures and corrective actions to prevent the ingress of ²²²Rn and to facilitate further actions wherever necessary.