Measurement of Outdoor Micro-Environmental Radio Frequency Electromagnetic Field Exposure Levels in Daily Life Using a Portable Measurement Device

Authors: Ikuyo M, Taki M, Onishi T.

Year: 2026

Category: Environmental Health Research

Journal: Electron Comm Jpn

DOI: 10.1002/ecj.70015

URL: https://onlinelibrary.wiley.com/doi/10.1002/ecj.70015

Abstract

Overview

This research project focuses on clarifying actual human exposure levels to radio frequency electromagnetic field (RF-EMF) in daily life and investigating effective risk communication methods using measured RF-EMF exposure data. Measurements targeted various environments including major railway station areas, shopping streets, residential areas, and public parks, covering both urban and suburban locations in Japan. The goal was to acquire detailed data supporting an improved understanding of micro-environmental personal RF-EMF exposure levels.

Methodology

  • Measurements performed using the ExpoM-RF4 portable device with a triaxial isotropic antenna.
  • Device covered 50 MHz to 6 GHz frequency range, collecting effective E-field strength values at 10 second intervals, and GPS tracking was enabled.
  • Measurements conducted both ways (outbound and return) along designated walking routes (15-20 minutes each direction).
  • Frequency bands targeted included those used for mobile phone systems, FM broadcasting, terrestrial television, and wireless LANs.

Findings

  • Urban areas exhibited significantly higher RF-EMF exposure levels compared to suburban areas.
  • Among different environments, railway stations had the highest exposure, followed by shopping streets, residential areas, and parks.
  • No significant differences were found between measurements taken on the way to and from the designated routes.
  • There is a positive proportional relationship between RF-EMF exposure levels and population density or floating population.
  • Measurements via portable device agree with previous spot and vehicle-based data, even accounting for human body shielding effects.

Conclusion

This study demonstrates the effectiveness of portable devices in assessing personal, micro-environmental RF-EMF exposures during daily activities and highlights that higher exposure levels are associated with populated urban environments, especially near railway stations. The findings underscore the necessity of further comprehensive studies, as the effects of prolonged RF-EMF exposure remain an important public health concern, and reinforce the link between environmental EMF levels and potential health risk.

RF-EMF exposure assessment urban environment portable measurement population density micro-environment health risk
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