In the project, 38 out of the 65 gas stations were sampled; 61 samples were sampling and analyzed from the underground water of the wells of gas stations, and 21 samples were sampling and analyzed from the ordinary wells. 238 air samples were sampling and analyzed. According to the data of the analysis and survey of the project to establish the risk assessment of the ingestion and inhalation of MTBE of the inhabitants who live around the gas stations. The result of cancer risk assessment was assessed, which was lower than the threshold value (10-6) that ordinary people can withstand. In the project, regulations and measures governing the control of MTBE from the USEPA, the Environmental Protection Bureau of California, Europe and Japan were gathered and studied. Among them, the regulations and the relevant measures (including the reasons for such ban, the assessments and preparation before such ban was enforced, the minimization of the impacts resulting from such ban, the necessary coordination of the relevant government departments or agencies in order to carry out the ban, the pertinent periods of the ban and the main considerations of such ban) regarding the ban of the use of MTBE enforced by the state government of California were studied and may be used as an important reference case in the decision-making of this country on the control of the use of MTBE. The EU expressed that, though the Federal Government of the US has announced its ban on the use of MTBE as an additive to gasoline, the EU will only tighten and enforce the control measures on the oil storing facilities, including underground oil storing facilities, pipelines, the detection of oil leakages, monitoring, etc.

methyl tertiary-butyl ether(MTBE), gasoline station,,risk characterization