Physics and Biochemical Sciences Department, Malawi University of Business and Applied Science, Chichiri, Blantyre 312225, Malawi.
Department of Mathematical Sciences, Malawi University of Business and Applied Science, Chichiri, Blantyre 312225, Malawi.
Int J Environ Res Public Health. 2023 Mar 1;20(5):4413. doi: 10.3390/ijerph20054413.
In this study, electric field and magnetic flux density pollution levels were measured in southern Africa, a case of Blantyre City in Malawi, between 2020 and 2021. Sixty short-term measurements were performed using Trifield Electro Magnetic Frequency meter model TF2 in 30 different locations. Five high-population-dense sampling points were selected from school campuses, hospitals, industrial areas, markets, residential areas, and within the commercial and business center (CBC) of Blantyre. Electric field and magnetic flux density pollution monitoring was conducted between 10:00-12:00 h and 17:00-19:00 h for short-range analysis. Short-range results show that the maximum measured electric field pollution were 249.24 mV/m and 207.85 mV/m between 10:00-12:00 and 17:00-19:00 respectively, which are below the public limits of 4200.00 mV/m for public exposure. Similarly, maximum short-range results for magnetic flux density were 0.073 G and 0.057 G between 10:00-12:00 and 17:00-19:00 respectively which are below the public limits of 2 G for public exposure. Both measured electric and magnetic flux density were compared with the International Commission on Non-Ionizing Radiation Protection (ICNIRP), World health organization (WHO), and Institute of electrical and electronics engineers (IEEE). It was determined that all measured values for both electric and magnetic flux density were smaller than set limits for non-ionizing radiation for both public and occupation health. More importantly, these background measurements establish a baseline for future changes to be compared against public safety.
本研究于 2020 年至 2021 年期间在南非（马拉维布兰太尔市）测量了电磁场和磁通密度污染水平。使用 Trifield 电磁频率计模型 TF2 在 30 个不同地点进行了 60 次短期测量。从学校校园、医院、工业区、市场、住宅区以及布兰太尔的商业和商业中心（CBC）选择了五个人口密集采样点。在 10:00-12:00 和 17:00-19:00 进行了短期电磁辐射污染监测，用于进行短距离分析。短距离结果表明，10:00-12:00 和 17:00-19:00 之间测量的最大电场污染分别为 249.24 mV/m 和 207.85 mV/m，均低于公众暴露的 4200.00 mV/m 公众限制。同样，10:00-12:00 和 17:00-19:00 之间测量的最大磁场强度分别为 0.073 G 和 0.057 G，均低于公众暴露的 2 G 公众限制。测量的电场和磁场强度均与国际非电离辐射防护委员会（ICNIRP）、世界卫生组织（WHO）和电气和电子工程师协会（IEEE）进行了比较。结果表明，电场和磁场强度的所有测量值均小于非电离辐射对公众和职业健康的设定限值。更重要的是，这些背景测量为未来的变化建立了一个基准，以便与公共安全进行比较。
