In a paper we describe electromagnetic fields in ultra low and extra low frequency ranges (0,1 to 300 Hz) together with time variation of the natural electromagnetic environment. In particular we describe the Earth - ionosphere cavity resonanse effect together with the continuous and irregular pulsation. Also, we discuss the health risk connected with residential exposure to power-frequency electromagnetic fields, high voltage transmission lines and communication antennas. In conclusion we point out controversial opinions connected with existing safety norms.
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