en Health Health Original Research Original Research In order to evaluate the relationship between the concentration of welding fumes and cigarette smoke on the bronchopulmonary system function, a comparative study of spirometric measurements in 100 welders and 50 healthy volunteers was performed in an automobile manufacturing company. Two groups of workers were matched according to their age, height, smoking habit, years of service and social class. Their health survey was evaluated by questionnaires, spirometry, chest x-ray and clinical research. Statistical tests were done for all variables of groups showing different types of pulmonary functions. 32 percent of welders had a reduction in pulmonary function, and respiratory symptoms such as dyspnea, cough, rales and sputum. Chest x-ray abnormalities (assidrosis) were higher in welders (22%) than the control group (8%). Occupational Health, Welding Fumes, Welder\'s Lung Functions. 325 328 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1-336&slc_lang=en&sid=1 HOSSEIN KAKOEE 20031947532846005014 20031947532846005014 Yes From the Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, P. O. Box 6446-14155, Tehran, Islamic Republic of Iran