National Institute of Information and Communications Technology, Tokyo 184-8795, Japan.
Int J Environ Res Public Health. 2021 Jul 30;18(15):8068. doi: 10.3390/ijerph18158068.
Recent progress in wireless technologies has made human exposure to electromagnetic fields (EMFs) increasingly complex. The situation can increase public concerns related to possible health effects due to EMF exposure. Monitoring EMF exposure levels and characterizing them are indispensable for risk communications of human exposure to EMFs. From this background, a project on the acquisition, accumulation, and applications of EMF exposure monitoring data in Japan was started in 2019. One of the objectives of this project is to obtain a comprehensive picture of EMF exposure in actual daily lives. In 2019 and 2020, we measured the electric field (E-field) strength from mainly mobile phone base stations in the same areas as those in measurements conducted in 2006 and 2007 by the Ministry of Internal Affairs and Communications (MIC), Japan, and compared the data to investigate the time-course of the EMF environment. The number of measured points was 100 (10 × 10 grids) in an area of 1 km × 1 km in two urban and two suburban areas, and that in an underground shopping mall was 158. This large-scale study is the first in Japan. As a result, we found that the measured E-field strengths tended to be higher in 2019 and 2020 than those in 2006 and 2007, especially in the mall. However, the median ratios to the Japanese radio wave protection guideline values for urban areas and malls are lower than -40 dB.
近年来，无线技术的进步使得人类接触电磁场（EMF）的情况变得越来越复杂。这种情况可能会增加公众对 EMF 暴露可能产生的健康影响的担忧。监测 EMF 暴露水平并对其进行描述，对于 EMF 暴露风险沟通是必不可少的。基于这一背景，日本于 2019 年启动了一个关于获取、积累和应用 EMF 暴露监测数据的项目。该项目的目标之一是全面了解人们在日常生活中的 EMF 暴露情况。在 2019 年和 2020 年，我们测量了主要来自移动电话基站的电场（E 场）强度，这些地区与日本总务省（MIC）在 2006 年和 2007 年进行的测量相同，并对数据进行了比较，以调查 EMF 环境的时间变化。在两个城市和两个郊区的 1 公里×1 公里的区域内，测量点的数量为 100 个（10×10 个网格），地下购物中心的测量点数量为 158 个。这是日本首次进行如此大规模的研究。结果表明，2019 年和 2020 年测量到的 E 场强度往往高于 2006 年和 2007 年，尤其是在购物中心。然而，城市和购物中心的日本电波保护指导值的中位数比值低于-40dB。
