Electromagnetic fields are generated by presence of electric charges, and in residential setting, are generally associated with extremely low frequencies (ELF) generated by electrical appliances, wires and power lines. Some debate still exists over the actual health hazards associated with residential exposure to ELF, however, the prevailing opinion of the scientific community and that of the National Institutes of Health (1998 press release statement regarding power-frequency fields) is that EMF associated with residential exposure can only be classified as a “possible,” but not “probable” human carcinogen. Meaning, it cannot be excluded as a cause, but has not been shown to be a cancer-causing agent. One way to measure the levels of EMF in the home is with a gauze meter. However, since no action level has been established by the EPA, it is difficult to determine the level of concern based on these findings.