輸送，通信，医療など様々な分野における技術革新が進む近年，日常環境において公衆が種々の周波数の磁界に曝露する機会が増えており，電気鉄道もその1つである。鉄道における磁界の特徴として，それぞれの発生源ごとに異なる特徴を持った磁界が，複合して発生することが挙げられる。その周波数帯域は静磁界から中間周波変動磁界（300Hzから10MHz：世界保健機関（WHO）の定義による）であることが知られている1）。%The magnetic fields (MFs) of inside and/or outside electric cars are ranged from static to intermediate frequency (IF) and intricately overlapped in consequence of driving mode, train location, vehicle installed-devices, etc. Although there are a lot of studies concerning biological effects of extremely low frequency (ELF)-MF and radiofrequency electromagnetic field because of public concern of its health risks, those regarding the complex MFs have been insufficient. In this study, the mutagenic effect of complex MF with static-, ELF- and IF-MFs was evaluated using the mutation assay in bacteria (Ames' test) and mammalian cells (the mouse lymphoma assay). Consequently, no mutagenicity was observed under all of exposure conditions in this study. This suggests that the complex MF does not have mutagenicity that induces point mutation or chromosomal mutation.
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