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This Health Hazard Evaluation (HHE) report and any recommendations made herein are for the specific facility evaluated and may not be universally applicable. Any recommendations made are not to be considered as final statements of NIOSH policy or of any agency or individual involved.Additional HHE reports are available at http://www.cdc.gov/niosh/hhe/reports This Health Hazard Evaluation (HHE) report and any recommendations made herein are for the specific facility evaluated and may not be universally applicable. Any recommendations made are not to be considered as final statements of NIOSH policy or of any agency or individual involved.Additional HHE reports are available at http://www.cdc.gov/niosh/hhe/reports This Health Hazard Evaluation (HHE) report and any recommendations made herein are for the specific facility evaluated and may not be universally applicable. Any recommendations made are not to be considered as final statements of NIOSH policy or of any agency or individual involved. applicable. Any recommendations made are not to be considered as final statements of NIOSH policy or of any agency or individual involved.Additional HHE reports are available at http://www.cdc.gov/niosh/hhe/reports ii PREFACEThe Hazard Evaluations and Technical Assistance Branch of NIOSH conducts field investigations of possible health hazards in the workplace. These investigations are conducted under the authority of Section 20(a)(6) of the Occupational Safety and Health Act of 1970, 29 U.S.C. 669(a)(6) which authorizes the Secretary of Health and Human Services, following a written request from any employer and authorized representative of employees, to determine whether any substance normally found in the place of employment has potentially toxic effects in such concentrations as used or found.The Hazard Evaluations and Technical Assistance Branch also provides, upon request, medical, nursing, and industrial hygiene technical and consultative assistance (TA) to federal, state, and local agencies; labor; industry; and other groups or individuals to control occupational health hazards and to prevent related trauma and disease. Mention of company names or products does not constitute endorsement by the National Institute for Occupational Safety and Health. ACKNOWLEDGMENTS AND AVAILABILITY OF REPORT SUMMARYDuring November 30 through December 2, 1994, the National Institute for Occupational Safety and Health (NIOSH) conducted a health hazard evaluation (HHE) at two Exxon service stations located in the greater Newark, New Jersey area. NIOSH investigators performed environmental monitoring to assess service station attendants' exposures to oxygenated gasoline that contained methyl tert-butyl ether (MtBE), which is an oxygenating compound blended with unleaded gasoline to help reduce vehicle emissions. Environmental measurements were made using two methods: (1) conventional air sampling (NIOSH Method 1615) and (2) video exposure monitoring with the use of real-time instrumentation.Laboratory analysis of 21 personal breathing-zo...