The study is a cross-sectional research at the Telecom units of postal sector during the time from 2008 to 2010. The results of the study show that the average CO2 concentration is 1084 + or - 219mg/m3, 47,32 percent of the samples exceeded the permitted standard. The synthetical value of chemicals with the same effective way in working office of '1080' operators is 1,32 times higher than permitted. Some of the diseases often found in operators seem to increase, indicating the consequences of detrimental labor conditions such as: the proportion of allergic rhinitis is 31,44 percent, chronic sore throat is 31,36 percent, refraction errors is 30,83 percent, osteoarticular diseases is 29,06 percent, gastroưduodenal diseases is 20,17 percent, conjunctivitis is 17,64 percent, sinusitis is 16,72 percent, neurodegenerative synưdrome is 13,88 percent, which is higher than the control group and increases with the intensity of work with statistical significance.