All analytical measurements were performed in duplication to give value with standard deviation. All analyses were carried out with SPSS 17.0 for Windows statistical software package. Descriptive statistical analysis was evaluated on concentrations of parameters. One Way Anova: Post HOC Multiple Comparison-LSD was computed to compare mean values between ambient air and personal exposure parameters of three difference brands of gasoline station. The pair t-test compared between urinary biomarker levels between before and after appropriate intervention. Linear regression was estimated by correlation between the parameters.