## 4 Conclusions  
The results of our study show that the uncertainty of EMF exposure assessments (normalized to the parameters of the unperturbed EMF) from wearable RF EMF measurement equipment (delivering the results of measurements of parameters of EMF disturbed by the proximity of the user wearing this equipment) may be significantly reduced by appropriate using a distributed (multi-location) measurement system. This would allow workers' exposure evaluating to be significantly improved using wearable measurements with respect to exposure limits set by labour regulations with regard to the parameters of unperturbed RF EMF. The obtained results (mimicking the simultaneous application of two to seven measurements) suggest that this approach to evaluating workers' RF EMF exposure may be sufficiently standardized for use in legally oriented studies. The distributed wearable EMF measurements systems may allow the autonomous evaluation of workers' exposure to RF EMF without continuous supervision of shift-long measurements by personnel responsible for evaluating workers' exposure, while maintaining the quality sufficient for their results to be used in the exposure evaluation required by labor law. It was confirmed the applicability of the helmet, which must be used in many work environments, as a potential location of one of measurement sensors in the distributed measurement system designed for the use in the work environment to improve the exposure evaluation quality. Using the helmet routinely worn by workers, adapted to carry an EMF-sensitive probe and other electronics of the distributed measurement system, would not un-duly increase the worker's load, unlike another additional (not routine) outfit, which otherwise would need to be carried by the worker whose EMF exposure is evaluated. Further studies are necessary to achieve broader parameterization of the analysed problems involving the uncertainty of EMF exposure evaluation using on-body measurement systems and the relevant procedures of analysing the measurement results. Conceptualization, K.G., J.K. and P.Z. ; methodology, K.G., J.K. and P.Z. ; software, P.Z. ; validation, K.G. and J.K.; formal analysis, K.G., J.K. and P.Z. ; investigation, K.G., J.K. and P.Z. ; resources, K.G. ; data curation, K.G. and P.Z. ; writing--original draft preparation, K.G. and J.K.; writing--review and editing, P.Z. and J.K.; visualization, P.Z. ; supervision, J.K.; project administration, K.G. All authors have read and agreed to the published version of the manuscript. The results of research carried out within the 6 th stage of the National Programme \"Gov-ermental Programme for Improvement of Safety and Working Conditions\" funded by the resources of the National Centre for Research and Development; task no. III.PN.07: \"Automation system for electromagnetic field investigations in the environment, for the purposes of evaluating and documenting, and reducing electromagnetic hazards in the working environment at selected installations and device\"; The Central Institute for Labour Protection-National Research Institute is the Programme's main co-ordinator. Not applicable. The original contributions presented in this study are included in the article. Further inquiries can be directed to the corresponding author. The authors declare no conflicts of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results. The following abbreviations are used in this manuscript: