Numerous investigations have confirmed the occurrence of various biological effects evoked in humans by pulse microwave radiation emitted from radars or cellular phones. In such exposures, the electromagnetic energy may reach very high values of power density in peak at relatively low time-averaged levels of power density. Up till now, no one has evidenced that the relationship between radiation dose and biological effects has the same correlation function for weak field as well as for a very strong field in peak. The proposed exposure levels of pulse-modulated electromagnetic fields (Smax pulse) for the general and occupational populations are described.