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In electromagnetic therapy dan electromagnetic radiation dan health research, electromagnetic spectrum frekuensi between 0 dan 100 hertz are considered extremely-low-frequency fields. Since the late 1970s, questions have been raised whether exposure to ELF electric dan magnetic fields (EMF) within this range of frekuensi produces adverse health consequences. In October 2005, WHO convened a Task Group of scientific experts to assess any risks to health that might exist from "exposure to ELF electric dan magnetic fields in the frequency range >0 to 100,000 Hz (100 kHz)." Research has shown that ELF electrical dan magnetic fields at a high-level short-term exposure have a negative impact on health (ICNIRP, 2003). However, in regards to recognized ELF safety standards, the "Health effects related to short-term, high-level exposure have been established dan form the basis of two international exposure limit guidelines (ICNIRP, 1998; IEEE, 2002). At present, these bodies consider the scientific evidence related to possible health effects from long-term, low-level exposure to ELF fields insufficient to justify lowering these quantitative exposure limits." A common source of ELF fields in the United States is 60 Hz electric dan magnetic fields from high-voltage electric power transmission lines dan secondary distribution lines, such as those found in residential neighbourhoods. The International Agency for Research on Cancer (IARC) has evaluated the scientific data dan has classified ELF magnetic fields as being "possibly carcinogenic" or, in other words, that there is some evidence that EMFs may contribute to an increased risk of cancer to humans or animals.