Extremely low frequency (ELF) magnetic field (MF) exposure in electric vehicles (EVs) has\nraised public concern for human health. There have been many studies evaluating magnetic field\nvalues in these vehicles. However, there has been no report on the temporal variation of the magnetic\nfield in the cabin. This is the first study on the long-term monitoring of actual MFs in EVs. In the\nstudy, we measured the magnetic flux density (B) in three shared vehicles over a period of two years.\nThe measurements were performed at the front and rear seats during acceleration and constant-speed\ndriving modes. We found that the B amplitudes and the spectral components could be modified by\nreplacing the components and the hubs, while regular checks or maintenance did not influence the B\nvalues in the vehicle. This observation highlights the necessity of regularly monitoring ELF MF in\nEVs, especially after major repairs or accidents, to protect car users from potentially excessive ELF\nMF exposure. These results should be considered in updates of the measurement standards. The ELF\nMF effect should also be taken into consideration in relevant epidemiological studies.
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