Specific amounts of bacteria and fungi in the room can cause Sick Building Syndrome (SBS). The main reason for bacteria and fungi accumulation is a lack of air circulation in the air-conditioned room. Therefore, we study exhaust fan usage to microorganism concentration in the air-conditioned room. The objective of this study is to find the optimum exhaust fan running time for reducing microorganism concentration until below the threshold value. The quasi-experiment was using with repeated experiments and non-random methodology. The samples were consisting of four air-conditioned classrooms with six repeated measurements. The sampling instrument used a petri dish filled with NA (Nutrient Agar) and PDA (Potato Dextrose Agar) placed at five points in each room. The results showed that the variation of exhaust fan running time sig affected the concentration of bacteria (sig ~0) and fungi (sig 0.023) in the classrooms. We found that exhaust fan can reduce the bacteria concentration. Although we observed that the exhaust fan gives inconsistency effect to reduce the fungi concentration in the classrooms.
Exposure to cigarette smoke in public places affects the lung capacity of workers. Cafe workers are a population susceptible to cigarette smoke exposure. This study aimed to analyze the risk factors associated with the lung capacity of cafe workers. This study used an observational method with a cross-sectional approach. The sample was composed of 74 participants. Data collection was carried out by interviewing and observing respondents. Exposure measurement to inhaled smoke was done using interviews and checking lung capacity using a spirometer. The Chi-square test was used to determine the relationship between risk factors and lung capacity. The results showed a significant relationship between age (p-value = 0.006) and the lung capacity of cafe workers. This meant that the older a person was, the greater the risk of decreased lung function. This study concluded that there was a significant relationship between cigarette smoke exposure, age, and the lung capacity of cafe workers. The intervention needs to be done to make a preventive measure by establishing non-smoking area regulations in public spaces and monitoring the workplace environment.
Abstract. The cement industry is the largest manufacturing industry, vital for sustainable development, and very risky for workers to be exposed to dust in various processes, including production. Continuous exposure to dust can cause pulmonary function disorders. This study aimed to analyze the relationship between dust exposure, age, length of work, working period, use of PPE (masks), smoking habits, and pulmonary function disorders in labor. This research used an observational method with a cross-sectional approach. The research sample was a total population of 38 male workers at Semen X company, engaged in the cement bagging industry as business activities. Data collection was by interviewing respondents, measuring the level of inhaled dust with a personal dust sampler, and checking the lung capacity with a spirometer. Data analysis was performed bivariate with the chi-square test. The results showed that there was a relationship between the use of PPE (mask) (p = 0.006) with pulmonary function disorders.
Introduction: Environmental factors such as vibration can affect work fatigue. The previous research results showed that there was a relation between vibration and fatigue, with the use of ergonomic seats by bus drivers. Then conducting experimental research on making ergonomic seat padding made from coconut fiber to reduce the level of vibration and driver fatigue was investigated. The purpose of this research was to analyze the differences in seating vibrations and the bus driver fatigue who did not use a padding seat and one who used it. Methods: The research design was experimental. The research subjects were 42 bus drivers. The vibration intensity was measured using a vibrometer and work fatigue was measured using a reaction timer, then the data were analyzed by T-test. Results: Based on research results the vibration of bus drivers who did not use seat padding was greater than those who did (p=0.001). Those who used seat padding had lower mean fatigue than drivers who did not use it (p=0.001). Conclusion: Vibration and work fatigue in bus drivers who did not use a padding seat was greater than those who used it and the difference was statistically significant. The use of ergonomic seating for bus drivers was very useful for reducing vibration.
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