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Abstract：
The gradual increase in electromagnetic field (EMF) exposure levels poses a potential threat to human health and the normal operation of electronic systems. In order to know the environmental EMF conditions, measurements were carried out on roads of about 400 km in the urban area of Beijing, China. The measurement results show that the electric field strength of about 89% of the sampling points is within 3 V/m, and the electric field strength of other sampling points is relatively high. Combined with further spectrum analysis, it was found that the electric field strength of one road section exceeded the national standard limits. In addition, to help quickly identify the general condition of the environmental EMF, a set of procedures for mining the association rules between the electric field strength and population density and building density is proposed in this paper. The final association rules show that the electric field strength is usually lower than 1.5 V/m in areas with medium or lower population density and areas with low building density; the electric field strength in areas with extremely high population density and areas with high building density is usually 1.5-4 V/m; while the electric field strength higher than 4 V/m mainly occurs in areas with extremely high population density. It is recommended to focus on strengthening the monitoring of EMF in areas with extremely high population density, and at the same time continuously pay attention to the trend of the urban EMF levels, so as to achieve early warning and treatment of relevant risks.
摘要：
电磁场（EMF）暴露水平的逐渐增加对人类健康和电子系统的正常运行构成了潜在威胁。为了了解环境EMF条件，在北京市区约400公里的道路上进行了测量，中国。测量结果表明,89%左右的采样点的电场强度在3V/m以内,其他采样点的电场强度相对较高。结合进一步的频谱分析，发现一条路段的电场强度超过了国家标准的限值。此外,为了帮助快速识别环境EMF的一般状况，本文提出了一套挖掘电场强度与人口密度和建筑物密度之间关联规则的方法。最终的关联规则表明，在人口密度中等或较低的地区和建筑物密度较低的地区，电场强度通常低于1.5V/m；在人口密度极高的地区和建筑物密度较高的地区，电场强度通常为1.5-4V/m；而电场强度高于4V/m主要发生在人口密度极高的地区。建议在人口密度极高的地区,重点加强对EMF的监测,同时不断关注城市EMF水平的趋势，从而实现对相关风险的预警和处理。
