Abstract

Overview

Electromagnetic fields (EMFs) prevalent in schools may pose health risks to children. This study investigates the exposure levels of extremely low frequency magnetic fields (ELF-MFs) and extremely low frequency electric fields (ELF-EFs) within secondary schools in Bangkok, Thailand.

Findings

• Assessment conducted in 60 classrooms across three schools during instructional hours.
• Measurements utilized a Narda EFA 300 field analyzer to evaluate the exposure levels of ELF-MFs ranging from 5 Hz to 32 kHz and ELF-EFs from 5 Hz to 2 kHz.
• Results indicated that while overall exposure levels align below the ICNIRP guidelines, approximately 21.67% of classrooms exhibited magnetic field strength above 0.2 μT.
• The principal sources of ELF-EMFs were identified as electrical equipment and wiring within the school premises.

Conclusion

Despite the adherence to current safety guidelines, the existing levels warrant further investigation, especially concerning long-term exposure effects on children's health. Future studies should expand to other school areas and include measurements in environments where children spend substantial time, such as their bedrooms.