ITU-T Recommendations

Exclusion zones are described by the compliance boundaries around radio base stations and transmitting stations in which the electromagnetic fields may exceed the radio frequency electromagnetic field (RF-EMF) exposure limits. The general public shall not have access to those areas. Exclusion zones are also defined for occupational exposure. Those areas are generally positioned on rooftops in urban or suburban locations. Their shape and dimensions may differ depending on the regulations.
Recommendation ITU-T K.153 includes information on how the exclusion zones should be determined based on the data concerning operating frequencies and equivalent isotropically radiated power (EIRP) on each of the operating frequencies. It also includes information on cases in which there are no exclusion zones. For example, on masts, especially in rural areas, there is no need for any materialization as the general public does not have access to this zone and access for workers is also limited and usually exists only in the front of the transmitting antennas. Furthermore, some other transmitters do not need any compliance boundary as the installed power level is so low that they are compliant even when touching the transmitter.