Wasana SilangamWitaya YoosookPornpimol KongtipAmarin KongtawelertKeson TheppeangMahidol UniversityMinistry of Labour2019-08-232019-08-232018-05-01Radiation Protection Dosimetry. Vol.179, No.3 (2018), 248-25217423406014484202-s2.0-85047834132https://repository.li.mahidol.ac.th/handle/20.500.14594/45913© The Author(s) 2017. Published by Oxford University Press. All rights reserved. Schools are a significant location where children are exposed to electromagnetic fields (EMFs), which may cause adverse health effects. This cross-sectional study aimed to examine exposure levels to extremely low frequency magnetic fields (ELFMFs) with a range of 5Hz-32 kHz, and ELF-electric fields (ELF-EFs) with a range of 5Hz-2 kHz in secondary schools in Bangkok, Thailand. This study was conducted in 60 classrooms from three schools during class hours. Spot measurements were taken with a Narda EFA 300 field analyzer to evaluate exposure levels. This study showed that ELF-EMF exposure levels are lower than ICNIRP guidelines, while 21.67% of classrooms had a magnetic field strength above 0.2 μT, and the main sources of ELF-EMFs were electrical equipment and electrical wiring. Future studies should measure ELF-EMF levels in other areas and evaluate the effects of long term exposure to ELF-EMFs on children's health.Mahidol UniversityHealth ProfessionsMedicinePhysics and AstronomyArticleSCOPUS10.1093/rpd/ncx266