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Abstract. Many factors affect the impaired lung function capacity. This study aims to look at the determinants of lung function capacity. The study was conducted at Tirtonadi Terminal. This study uses an observational design with a cross-sectional design. The population of workers was 54 people after the inclusion and exclusion criteria from the total population. a sample of 50 workers was taken using a random sampling technique. dust measurement based on SNI 16-7058-2004 uses a low volume sampler and is carried out at 06.00-10.00, 14.00-16.00. the measurement point is carried out at the west and east gates as the highest concentration of pollutants Measurement of lung function capacity using spirometry. Other variables were assessed using a questionnaire and a checklist sheet to determine the characteristics of the study respondents. The results showed significant levels of environmental dust, work area and use of significant masks with impaired lung function capacity with p-values = 0.003, 0.005 and 0.001. The use of masks during work must be a must for workers to protect from dust exposure which generally comes from motorized vehicles. Keywords: Environmental Dust Exposure, Lung Function Capacity