Introduction For many years the subject of the effects of electromagnetic radiation has been considered and attempts have been made to quantify particular limits that could be used to protect humans from undesirable effects. Studies in many countries by differing agencies have resulted in various administrative regulations. It is noteworthy and understandable that no single standard has emerged from all the efforts in this regard. This Report is intended to provide a single basis for the derivation and estimation of the values of electromagnetic radiation from a broadcast station that occur at particular distances from the transmitter site. Using such information@ responsible agencies can then develop appropriate standards that may be used to protect humans from undesirable exposure to harmful radiation. The actual values to be applied in any regulation will naturally depend on decisions reached by responsible health agencies@ domestic and worldwide. It is noted that this ITU-R Report and ITU-T Recommendations cover similar material@ but with an emphasis on different aspects of the same general subject. For example@ ITU-T Reommendations K.51 (Guidance on complying with circuits for human response to electromagnetic fields) and K.61 (Guidance to measurement and numerical prediction of electromagnetic fields for compliance with human limits for telecommunication installations) provide guidance on compliance with exposure limits for telecommunication systems. Appropriate reference information is included in Appendix 6.