This work is part of our researches to study the distribution of electromagnetic radiation from mobile base stations in populated areas.
The aim of this work was to study and analyze the electromagnetic situation before and after the introduction of fourth generation 4G technology at mobile base stations.
Materials and methods. We analyzed the maximum and average levels of electromagnetic radiation from mobile base stations located in Chernihiv region. The electromagnetic situation was studied both in urban areas and in rural areas. STATISTICA 10 was used for statistical analysis and calculations.
Results. It was established that after the implementation of 4G technology at mobile base stations in the territory of Chernihiv region, the median of the maximum levels of electromagnetic radiation increased by 151.9% (in particular, in urban areas by 93.0%), and the median of average levels - by 127.0% (in particular, in urban areas by 58.5%).
There were no cases of exceeding the maximum permissible levels of EMF both before and after the modernization of the base stations.
It was established that after the modernization of the base stations, the maximum and average levels of EMF in 21.9% of cases exceeded the "old" maximum permissible level - 2.5 μW/cm2.
Conclusions. It was found that after the introduction of the fourth generation 4G technology at the mobile base stations, the levels of electromagnetic radiation in Chernihiv region increased significantly. It has been proven that there are no prerequisites for increasing the maximum permissible level to 100 μW/cm2 when implementing 4G technology at mobile base stations.

Radiofrequency radiation, mobile base stations, 4G.

1. Moskalenko VF, Gulchiy OP, Colubchikov MV. [Biostatistics]. Kyiv: Knigaplus; 2009. 184 p. Ukrainian.

2. [Order of MH Ukraine from 01.08.1996 N 239. State sanitary norms and rules of protection of the population from influence of electromagnetic radiation]. Kyiv; 1996. Ukrainian. Available from: https://zakon.rada.gov.ua/laws/show/z0488-96#Text

3. [Order of MH Ukraine from 29.11.2013 N 1040. Method of calculating the distribution of electromagnetic field levels]. Kyiv; 2013. Ukrainian. Available from: https://zakon.rada.gov.ua/laws/show/z2130-13#Text

4. Singh K, Nagaraj A, Yousuf A, Ganta S, Pareek S, Vishnani P. Effect of electromagnetic radiations from mobile phone base stations on general health and salivary function. J Int Soc Prev Community Dent. 2016;6:54 9. doi: https://doi.org/10.4103/2231-0762.175413

5. Bogers R, van Gils A, Clahsen S, Vercruijsse W, van Kamp I, Baliatsas C et al. Individual variation in temporal relationships between exposure to radiofrequency electromagnetic fields and non-specific physical symptoms: A new approach in studying ‘electrosensitivity’. Environment International. 2018;121:297-307. doi: https://doi.org/10.1016/j.envint.2018.08.064

6. Falcioni L, Bua L, Tibaldi E, Lauriola M, De Angelis L, Gnudi F, Mandrioli D, Manservigi M, Manservisi F, Manzoli I, et al. Report of final results regarding brain and heart tumors in Sprague Dawley rats exposed from prenatal life until natural death to mobile phone radiofrequency field representative of a 1.8 GHz GSM base station environmental emission. Environ Res. 2018;165:496-503. doi: https://doi.org/10.1016/j.envres.2018.01.037

7. National Toxicology Program: NTP technical report on the toxicology and carcinogenesis studies in Hsd: Sprague Dawley sd rats exposed to whole body radio frequency radiation at a frequency (900 MHz) and modulations (GSM and CDMA) used by cell phones. NTP TR 595. 2018 March 26 28. doi: https://doi.org/10.22427/NTP-TR-595

8. National Toxicology Program: NTP technical report on the toxicology and carcinogenesis studies in B6C3F1/N mice exposed to whole body radio frequency radiation at a frequency (1,900 MHz) and modulations (GSM and CDMA) used by cell phones. NTP TR 596. 2018 March 26 28. doi: https://doi.org/10.22427/NTP-TR-596

9. Rodrigues NCP, Dode AC, de Noronha Andrade MK, O’Dwyer G, Monteiro DLM, Reis INC, et al. The Effect of Continuous Low-Intensity Exposure to Electromagnetic Fields from Radio Base Stations to Cancer Mortality in Brazil. International Journal of Environmental Research and Public Health [Internet]. MDPI AG; 2021 Jan 29;18(3):1229. doi: http://dx.doi.org/10.3390/ijerph18031229

10. Halak S, Dumansky V, Nikitina N, Bitkin S, Bezverkha A. [Hygienic characteristic of the electromagnetic situation created by the electromagnetic radiation of the antennas of mobile base stations in Cherkasy region before and after the introduction of 4G technology]. Med. perspekt. [Internet]. 2021 Dec 20 [cited 2022 Aug 17];26(4):161-5. Ukrainian. doi: https://doi.org/10.26641/2307-0404.2021.4.248215

Halak SS, Bezverkha AP, Dumansky VYu, Nikitina NG, Bitkin SV, Zotov SV. Hygienic characteristic of the electromagnetic situation created by antennas of mobile base stations in Chernihiv region before and after the introduction of 4G technology. Hygiene of populated places. 2022;72:84-89. Ukrainian.