Background: Dust exposure at quarry mines is inevitable and can result in poor air quality. This research aimed to assess pulmonary symptoms and lung functions of dust-exposed workers at an iron-ore mine in eastern Iran. Methods: An environmental cross-sectional study sampled 174 dust-exposed mine workers and 93 unexposed administrative employees as the reference group. A standardized questionnaire on respiratory symptoms was completed in accordance with recommendations of the American Thoracic Society(ATS). Calibrated spirometer measured Pulmonary Function Tests (PFTs). Data were analyzed via SPSS-21, integrating independent samples t-test, Chi-square and linear or logistic-regression models. Results: There was no significant variation between dust-exposed and reference groups in terms of age, weight, height, work experience and the number of smokers (P>0.05). Mean levels of exposure to inhalable and respirable mineral-dust were 15.09±2.34 and 3.45±2.57 mg/m3 respectively. Pulmonary capacities of dust-exposed group were considerably decreased as compared to others (Forced Vital Capacity [FVC] 86.55±13.77 vs. 105.05±21.5; Forced Expiratory Volume in 1 second [FEV1] 88.06±16.8 vs. 105.81±21.55; FEV1/FVC 103.03±18.17 vs. 93.3±12.49; and Peak Expiratory Flow [PEF] 89.82±22.58 vs. 98.09±20.60) (P<0.001); with a higher prevalence of cough (P=0.041), wheezing (P=0.032), and dyspnea (P=0.035) among formers. Age along with exposure to respirable-dust significantly reduced FVC, FEV1 and FEV1/FVC. Cigarette consumption attenuated FVC and FEV1 on an average of 5 to 9 units. Conclusion: Controlled occupational dust-exposure is a definitive pre-requisite to reduce respiratory problems among quarry workers, with an explicit consideration towards mineral- mine workers. Modifiable accomplices like smoking and non-compliance of PPEs usage should be amicably resolved.

Objective: The aim of this study was to investigate the moderating role of job control in relation to mental workload and job satisfaction of healthcare workers.Methods: This cross-sectional study was carried out on 480 nurses, midwives, and administrative workers in four educational hospitals of Ardabil, Iran. Research tools were included demographic information questionnaire, NASA-TLX questionnaire, job description index (JDI) questionnaire and job control inquiry.Results: Compared with administrative workers, mental workload of nurses and midwives was significantly higher and likewise mental workload of nurses was significantly difference compared to midwives (P &lt; 0.001). Nurses and midwives had substantially higher job satisfaction than administrative workers (P &lt; 0.001). Also, nurses and midwives had higher job control than administrative workers (P &lt; 0.001 and P = 0.002, respectively). Based on the designed model, the correlation between mental workload and job satisfaction was negative and significant (r = −0.22); which in the presence of job control, the relationship between the two variables of workload and job satisfaction slightly increased (r = −0.19, P &lt; 0.001). These conditions were the same in the three job groups separately.Conclusion: Mental workload is inversely related to job satisfaction and job control. Job control plays an important role in improving working conditions in healthcare workers.

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BACKGROUND: The general public has an important role in controlling the spread of infectious diseases by pursuing prophylactic measures. AIM: The aim of the present systematic review was to describe public perceptions, knowledge, attitudes, and behaviors toward COVID-19. METHODS: In this review, articles were extracted from the Google Scholar, Embase, Scopus, Web of Science, and PubMed search engines. The main keywords for the search were coronavirus, COVID-19, public perceptions, knowledge, attitudes, and behaviors. RESULTS: The knowledge level toward novel coronavirus in different countries was generally high, and it had an increasing pattern during the pandemic phase. Furthermore, the insight self-efficacy, perceived severity of the COVID-19, and intention to meet the needs of preventive measures have increased notably. Furthermore, there are several misconceptions and unconfirmed beliefs in the general public in the case of preventive measures recommended, in particular. CONCLUSIONS: Health authorities and other disease control centers should monitor public misconceptions and perceptions continuously and manage a trusting platform to be presented to the public, especially in the case of a novel disease outbreak.

Background and Objective: Silica dust is present in almost all mining operations and can cause various health problems such as silicosis in workers. The present study aimed to determine the total and respirable dust levels and the crystalline silica content of the soil in the breathing zone of workers in Iranian mines. Methods: This cross-sectional study was carried out in 2016-2017 on six Iranian silica mines. Dust sampling was performed according to the National Institute of Occupational Safety and Health (NIOSH) method No. 0600. The samples were collected from the respiratory zone of workers at 114 stations in different units of the mines. The silica content was measured using the standard NIOSH method No. 7601. The crystalline silica content in bulk samples collected from the soil was determined by using the X-Ray Diffraction (XRD) spectroscopy method. Results: The highest concentration of crystalline silica dust was 2.81±0.49 mg/m3 and was observed in the air of crushing unit of mine no. 6, and the lowest was 0.08±0.208 mg/m3 and was measured in the management/administration unit of mine no.1. The mean silica content in the solid surface of the mines was 91%. The total and respirable dust levels in all units of the mines except management/administration were higher than the permissible limit. The free silica content of all collected samples was substantially higher than the permissible limits, and in some cases, it was as much as 100 times above the standard level, which reflects the extremely high risk of working in these mines. Conclusion: Exposure of workers with crystalline silica dust in all units was higher than the standard recommended limits. It is imperative to adopt immediate measures based on technical, managerial, and personal protection solutions to reduce the exposure of workers to silica.

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Background and Objective:Organizational climate and organizational commitment have a tangible effect on organizational performance. This study aims to investigate organizational climate in a university of medical sciences along with organizational commitment and job burnout in the university staff.Methods:This cross-sectional study is carried outviadescriptive-analytical method on 250 employees of Torbat Heydariyeh University of Medical Sciences, Iran in 2016. Data collection tools include standard questionnaires of organizational climate, organizational commitment, and Maslach burnout inventory. Data analysis was carried out with SPSS software version 21 and Man-Whitney statistical tests, Kruskal-Wallis analysis, ANOVA, Chi-2, and Spearman’s correlation tests.Results:Average age of the participants was 34.52 ± 7.70 including 55.6% men and 44.4% women. In the present study, organizational climate of employees was medium and high, and also, mean score of the organizational commitment of subjects was 66.11 ± 16.35. The highest amount of employees job burnout was related to low level (66%). Organizational climate among the employees lead to higher organizational commitment (r=0.472, P<0.001), and greater organizational climate and commitment contributes significantly towards a decrease in job burnout (r=-0.227, P<0.001; r=-0.335, P<0.001).Conclusion:If the managers of these deputies pay more attention to the importance of the services of the health staff and manpower employed in this organization, they can improve the organizational commitment of healthcare workers and prevent their burnout, in order to maximize the quality of service delivery.

Background and Objective: Many indices are used to assess occupational heat stress at the work environments. The aim of this study was to evaluate heat stress using Wet Bulb Globe Temperature (WBGT) index and Discomfort Index (DI), and by measuring physiological responses in the workers of the rolling industry and comparing the appropriateness of these indices for measuring heat stress. Methods: This cross-sectional study was carried out on 90 healthy workers of a rolling industry in eastern Tehran in 2017. Physiological parameters of core body temperature (Tcr) and Heart Rate (HR) were measured during the working shift according to ISO9886 standard. At the same time, environmental variables such as the natural wet temperature (Tnw), dry temperature (Td) and globe temperature (Tg) were measured and recorded at the workstations. Then, the DI and the WBGT indices were calculated using the related formulae. Data were analyzed using SPSS v. 21, t-test and Pearson correlation coefficient. Results: The mean heat stress indices were significantly higher in working conditions than resting conditions, and there was a significant difference between the physiological parameters of Tcr and HR in resting and working conditions (P<0.001). According to the screening criteria of DI, 43.3% of the workers were exposed to the moderate level and 56.7% to the severe level of heat stress. There was a significant difference between the mean WBGT and the Threshold limit values (t= 4.903, P<0.001). Pearson correlation test showed that there was a significant and direct linear relationship between the WBGT and the physiological parameters of Tcr and HR (r=0.317, P=0.002; r=0.434, P<0.001, respectively). The DI index had a significant and direct linear relationship with HR; (r=0.229, P=0.03). Conclusion: The results showed that WBGT is a more appropriate index for evaluating the heat stress of workers in the rolling industry. High heat stress levels at the workstations along with heavy physical activity are health risks for workers in this industry; therefore, interventions must be undertaken to reduce exposure.