& objectives: Chromium plating is one of the most important sources of hexavalent chromium in the workplace. According to respiratory exposure to carcinogenic hexavalent chromium, it is necessary to monitor workers' exposure to electroplating industries. The aim of this study was to quantitative risk assessment for cancer in occupational and environmental exposures to chromic acid. Methods: This cross-sectional study was conducted in 10 shops in Tehran chrome plating. The respiratory exposure

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... Cr (VI) was measured in NIOSH 7600 method by the National Institute for Occupational Safety and Health America. In this study it was estimated that the risk of environmental carcinogenesis cumulative risk information with the help of cumulative risk information from the EPA America (IRIS) and the risk of occupational carcinogen by the World Health Organization guideline. It also was used regression models used to estimate the risk presented by Deborah Proctor both occupational and environmental carcinogens. Results: The middle exposure to hexavalent chromium mist in the workshop was 0.036±0.022 mg/m 3. Maximum exposure was in A7 Workshop with 0.096±0.0024 mg/m 3 and at least contact was in A4 Workshop with 0.023 mg/m 3. As a result of the risk assessment with the help of different methods used in this study were unacceptable The results show that these models environmental risk estimation model with the help of America Environmental Protection Agency significantly associated with risk is derived from the model Deborah Proctor (p=0.0001). But occupational risk estimates associated non-significant findings of the WHO model Deborah Proctor risk model was obtained from (p=0.68). Conclusion: Exposure in occupational groups with polished chrome higher than other occupational groups were identified. Of workers participating in the study, 6/68% less than the limit proposed in contact with Iran. While the carcinogenic risk models used in this study is higher than is acceptable in these cases. It Seems to reduce the risk of carcinogenesis is not keeping respiratory exposure in industry workers about occupational exposure to hexavalent chromium and must control measures to minimize the exposure to chromium. These results highlight the importance of using appropriate methods to control the chromium contamination at levels below the threshold limit.