BackgroundAdvances in science and technology of electrical equipment, despite increasing human welfare in everyday life, have increased the number of people exposed to Electro-Magnetic Fields (EMFs). Because of possible adverse effects on the health of exposed individuals, the EMFs have being the center of attention. This study was performed to determine possible correlation between Extremely Low Frequency Electro-Magnetic Fields (ELF EMFs) and sleep quality and public health of those working in substation units of a petrochemical complex in southern Iran.Materials and methodTo begin with, magnetic flux density was measured at different parts of a Control Building and two substations in accordance with IEEE std 644–1994. Subsequently, the questionnaires “Pittsburgh Sleep Quality Index” (PSQI) and “General Health Quality (GHQ)” were used to investigate relationship between ELF exposure level and sleep quality and public health, respectively. Both questionnaires were placed at disposal of a total number of 40 workers at the complex. The filled out questionnaires were analyzed by T-test, Duncan and the Chi-square tests.ResultsThe obtained results revealed that 28% of those in case group suffered from poor health status and 61% were diagnosed with a sleep disorder.However, all members in control group were in good health condition and only 4.5% of them had undesirable sleep quality.ConclusionIn spite of a significant difference between the case and control groups in terms of sleep quality and general health, no significant relationship was found between the exposure level and sleep quality and general health. It is worth noting that the measured EMF values were lower than the standard limits recommended by American Conference of Industrial Hygienists (ACGIH). However, given the uncertainties about the pathogenic effects caused by exposure to ELF EMFs, further epidemiological studies and periodic testing of personnel working in high voltage substations are of utmost importance.

The present study compared the effect of fabric type of working clothes on heat strain responses in different levels of physical workload and under different kinds of weather conditions. Four kinds of working clothing fabric that are greatly popular in Iranian industry were assessed on 18 healthy male at 2 environments: hot and humid (dry temperature [DBt]: 35°C and relative humidity [RH]: 70%) and hot and dry (DBt: 40°C and RH: 40%). The physiological responses such as heart rate and core body temperature were reported. It was found that there were no significant differences between different types of clothing fabric on cardiac and physiological parameters. It can be recommended that 100% cotton clothing ensemble during low-workload activities and 30.2% cotton-69.8% polyester clothing ensemble during moderate-workload activities is used for Iranian workers to maintain the cardiac and physiological strains as low as possible.

This study aimed to describe the noise pollution, and to identify the main noise source for providing sound abatement measures in a petrochemical company. In this context, environmental noise was measured and also the main sound sources were identified. Then, a formula has been proposed as an index of noise control priority to select one part of the company as the first priority for controlling noise. The main sound source of the part selected was found by referring to noise maps and contours. The sound source acoustic properties were analyzed and noise control measure suitable for the situation were adopted. The Company was divided into three sections depending on their noise levels including safe area (16.7%), caution area (74.5%) and danger area (8.8%).Compression part of Air plant was found to be the first priority for the adoption of noise abatement measures and Dryer machines were discovered to be the main sound source.

Background: Organizational culture is the most essential tool of an organization to increase the resilience of personnel in a healthcare system. Promoting organizational culture is an effective factor in increasing job satisfaction and reducing psychological burden, and burnout in nurses. Objectives: This study aimed to investigate the influence of organizational culture on resilience by mediatory effects of occupational stress, job satisfaction, and burnout in nurses using structural equation modeling. Methods: This cross-sectional study was conducted among 712 nurses working in seven hospitals in Tehran during the 2018 - 2019. The participants were selected by thee stratified random sampling method with proportional allocation. In detail, after determining the number of samples of each hospital, sampling was performed using a random number sequence. The data gathering was performed by using questionnaires. Data were analyzed by the SPSS, version 23.0, and LISREL, version 8.8. Results: We found a significant positive correlation between organizational culture and job satisfaction (r = 0.29) and resilience (r = 0.21) (P < 0.05). There was a significant negative correlation between organizational culture and occupational stress (r = -0.22), and burnout (r= -0.14) (P < 0.05). The goodness of fit index (GFI) for organizational culture, occupational stress, job satisfaction, burnout, and resilience was 0.97, 0.97, 0.98, 0.96, and 0.95, respectively. RMSEA index for organizational culture, job satisfaction, burnout, and resilience was 0.069, 0.093, 0.057, and 0.050, respectively, which showed that the model is appropriately fit. Conclusions: The findings of the present study indicated that promoting organizational culture and reducing occupational stress and burnout can improve job satisfaction and mental health in nurses.