Background: Long-term exposure to the compounds in petrol leads to deterioration of respiratory health for those exposed, even for seconds. The aim of this study to assess the impact of gases exhumed in a petrol station on the respiratory systems of petrol station workers through measuring the effect of petrol gases on the pulmonary functions and links to common respiratory symptoms. Methods: Comparative cross-sectional was formed by 208 workers were divided into two equal groups according to their exposure to petroleum vapors, case group represented the fuel workers who worked outdoor and control group represented the fuel workers who worked indoor without exposure to petroleum vapors. Using semi structured survey including questions related to individual demographic variables, work characters, workload, variables related to health surveillance of workers as use of personal protective equipment (PPE). Results: The results showed no statistically significant difference regarding demographic character between two group. We detected statistically significant difference between PSW group with control group regarding clinical symptoms as cough, tiredness, fatigue and breathing difficulties. Finally, according to spirometer results we found decline in the respiratory function tests as (FVC, FEV1, PEF, FEV1/FVC, FEF25,50,75) among PSW group with statistically significant difference with control group.