MTBE is one of the volatile organic compounds in the ambient air .The fuel loss at gas stations and traffic are the main sources of this compound in the air of the city. The studies show 52000 liters of gasoline is lost from the gas station across the city of Tehran. Each station losses approximately 415liters per day, which makes the area on and around the gas stations heavily polluted. In current study, MTBE were measured at two gas stations and 20 main cross streets, during summer and winter. The concentration of MTBE in Khavaran gas station in July and August (3.3-10.7 ppm) was higher than December (4.3-6.4 ppm).MTBE concentration in Beheshty gas station at that time (Summer) were 2.2 - 5.5 ppm . The mean concentration of MTBE in ambient air at the 20 measured places across the city was 0.01 -1.2 ppm . This study shows that effect of gas station as a point source of pollution is 30 m from center of gas station .
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