Elementary mercury using as cathode in process chlorine-alkali electrolyze. Mercury vapor makes in process going in work setting atmosphere. Aim of the work is to examine whether symptoms, signs and abnormal clinical and laboratory findings are in the correlation with work in the chlorine-alkali electrolyze. Examination of air pollution work setting discovers that the major factor of air pollution is mercury vapor. On periodical view at 2000, 2002 and 2004 year was examine 571 respondent, and their diagnosis was entered in report, from which was separated symptoms, signs and abnormal clinical and laboratory findings. Workers on different workplaces are exposes in different degrees. Examinees were divided in a four group according to the grade of exposure: I group day by day exposed; II group sporadically exposed; III group earlier exposed; IV group not exposed. I, II and III group are workers which work in the process chlorine-alkali electrolyze. IV group was control group and her compose administration personal. The statistical testing differences of frequency between groups according to the grade of exposure is showed there is statistical significantly difference between I and III, and II and IV groups. We are concludes that symptoms, signs and abnormal clinical and laboratory findings, statistically significantly, there is in persons which are permanently and long term worked in the chlorine-alkali electrolyze setting, from persons which are not permanently expose or nonexpose