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This article deals with the visualization of the intensity of the electromagnetic field in a production room with various electrical equipment. To assess the electromagnetic environment under the simultaneous influence of a set of electromagnetic field sources (radiation sources), a new approach is proposed, based on the formation of electromagnetic portraits and combined pictures of the electromagnetic radiation danger. Electromagnetic portraits and hazard pictures are obtained from the results of visual diagnostics of hazardous areas of external surfaces of radiation sources, a limited number of measurements at control points, and modeling of the electromagnetic field, taking into account the possibility of simultaneous influence and amplification of the resulting action of several radiation sources. The technical implementation of the proposed approach is provided by the developed intelligent system that allows real-time automation of the control of the electromagnetic environment and the formation of hazard patterns in the zones of exposure to electromagnetic radiation at various frequencies (up to 3 THz), taking into account the electromagnetic field overlay. A complex estimation of the hazard level is combined from the separate hazard of each electromagnetic field component the briefly described mathematical apparatus.