Taking in consideration the suggested guide-lines for the health-surveillance on workers exposed to N.I.R. and in particular to ELF and radio-frequency, a work-group of A.I.R.M. suggests the constitution of an italian network for electro-magnetic fields. An observatory will be founded to value the professional exposures and the undue situations of risk, a parallel one will take the census of the workers subdivided into classes for exposure levels, pathologies or symptomatologies imputable to electro-magnetic fields. This suggestion is addressed to the national environmetal hygienists and occupational physicians that are interested.