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To evaluate the power frequency electric and magnetic fields (EMF) inside and around power facilities quantitatively, it is important to measure actual values of them. However, there seems to have been no systematic research of this kind. Under this type of circumstance, the authors have planned and been carrying out international cooperative research among various countries on power frequency electric and magnetic fields measurements. This paper describes the results of the EMF measurement inside and around power facilities in Colombia, Cuba, Indonesia, Japan, Mexico, Thailand, and the U.S.