semi-quantitative assessment of the health risk of occupational exposure to chemicals and evaluation of spirometry indices on the staff of petrochemical industry

background & aims of the study: petrochemical industry is an important industry in the economic development of the country that causes employees have exposure with several kinds of contamination. the aim of this study was semi-quantitative assessment of the health risk of occupational exposure to chemical materials and investigation of spirometry indices between employees of petrochemical industry. material & methods: this cross-sectional study was conducted in one of the petrochemical industry complex in a special area of assaluyeh in iran in 2016. health risk assessment of exposure to harmful chemical agents was performed in all of units and during three stages (identification of harmful material, determination of hazard rate of the chemical material, exposure rate and estimate of risk rate). spirometry indices were measured using spirometry. results: the results of chemical materials risk assessment showed that raffinate in butadiene unit has identified the highest amount of risk rank among 27 chemical materials in investigated units. in comparison with spirometry indices in olefine unit between age with fvc parameter and history work with fvc and fev1 parameters has observed a significant and negative correlation (p<0.05). conclusion: the results of risk assessment in all of the petrochemical units showed that 48.14% of materials were at low risk level, 29.62% medium risk, 18.51% high risk and 3.7% had very high risk level. the variables affecting on spirometry employees such as age and work experience play an important role in reducing the pulmonary function tests in exposed subjects.