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W value is less than the ELF -EMF reported for some common household devices, such as an electric can opener with a maximum of 1500 mG at 6 inches. In a recent study of 3 ground mounted PV arrays in Massachusetts, the above results were confirmed The PV arrays had a capacity range of 1 to 3 5 MW Magnetic field levels along the PV array site boundary were in the very low range of 0 2 to 0 4 mG Magnetic fields at 3 to 7 feet from the inverters ranged from 500 to 150 mG At a distance of 150 feet from the inverters, these fields dropped back to very low levels of 0.5 mG or less, and in many cases to much less than background levels ( <0 2 mG) Potential Health Effects- Four research studies have reported an association between three to four mG EMF exposure and childhood leukemia, while 11 other studies have not. These studies are inconsistent and do not demonstrate a causal link that would trigger a World Health Organization (WHO) designation of EMF as a possible carcinogen Studies looking at other cancers in humans and animals have not found evidence of a link to residential ELF -EMF exposure Reference Exposure Levels- To protect the general public from health effects from short -term high level magnetic fields, the International Commission on Non - Ionizing Radiation Protection (ICNIRP, 2010) advised an exposure limit for extremely low frequency magnetic fields at 2000mG. ICNIRP determined that the evidence on the impact of long -term exposure to low level magnetic fields was too uncertain to use to set a guideline Guidelines for the magnetic field allowed at the edge of transmission line right -of- ways have been set at 200 mG by Florida and New York Exposure to magnetic fields greater than 1000 mG is not recommended for people with pacemakers or defibrillators (ACGIH, 2001) ELF -EMF does not appear to interfere with hearing aids, though interference from higher frequency EMF associated with cell phones has been reported Resources* American Conference of Government Industrial Hygienist (ACGIH) 2001 as cited in NIEHS 2002 California Department of Health Services (CA DHS) 2000 Electric and Magnetic Fields, measurements and possible effect on human health — what we know and what we don't know in 2000 This factsheet has a moderate level of technical detail and is intended for those with an interest in science For more information,see http / /www.dhs.ca gov /ps /deodc /ehib /. California Electric and Magnetic Fields Program, A Project of the California Department of Health Services and the Public Health Institute Chang, GJ and Jennings, C 1994 Magnetic field survey at PG &E photovoltaic sites PG &E R &D Report 007 5 -94 -6 Available 4 WHO has designated ELF -EMF as a possible carcinogen The use of the label "possible carcinogen" indicates that there is not enough evidence to designate ELF -EMF as a "probable carcinogen "or "human carcinogen," the two indicators of higher potential for being carcinogenic in humans 11