Abstract

Abstract Summary

Overview

Car-mounted measurements were utilized to assess radiofrequency electromagnetic field exposure levels across a significant area surrounding Tokyo.

Methodology

The study initially evaluated the impact of the car body on the electric field measurements in an anechoic chamber. Measurements were taken over a distance of 13,800 km around a 100 km radius centered on Nihonbashi, Tokyo, from May 2021 to February 2022.

Findings

• E-field strengths in FM/TV frequency bands were generally lower compared to mobile phone base stations.
• The 5G frequency band's E-field strength was substantially lower, by about 20–30 dB, than all other mobile phone system bands but varies depending on the data traffic.
• E-field strength was found to be higher in Tokyo compared to other prefectures.
• Repeated measurements showed a standard deviation of less than 3 dB, confirming the reproducibility of the E-field measurements.

Conclusion

The study confirmed a positive relationship between the E-field strength from mobile phone base stations and population density. This suggests a potential implication regarding population density and electromagnetic field exposure which warrants further investigation into its impact on health.