An examination of the working area in one branch of Electronic Industry in Nis (TV) was performed together with the state of the pulmonary ventilation in workers who worked in this department (120). The workers were divided into two groups: smokers (32) and non-smokers (88) and the values obtained from lung function tests were compared with the normal standards. The results of the examination showed that on these working places some chemical noxiousnesses were present (lead, tin, calaphonium and ethyl alcohol) which might have caused the increase of air flow resistance in the respiratory tracts of the exposed workers.