The Japan Air Self-Defense Force flight line personnel are occupationally exposed to jet fuel JP-4 including volatile organic compounds (VOCs) such as benzene and n-hexane. We measured for 28 flight line personnel exposures to VOCs during JP-4 fueled C-130 aircraft maintenance on a day shift. There were 10 straight-chain alkanes with a chain length of C6 to C15 and 5 aromatic hydrocarbons including benzene, toluene, ethylbenzene and xylenes. The estimated flight line personnel exposure levels (n-hexane; 517ppb, n-heptane; 176ppb, toluene; 67ppb and benzene; 73ppb) calculated from the day shift exposure levels of this highest sample date did not exceed the values of exposure limits recommended by the National Institute for Occupational Safety and Health and Japan Society for Occupational Health. The analysis of the personal work activity records revealed refueling operation caused increase of the personal VOCs exposure levels. Other factors, such as flight line operations, working time and subjective symptoms did not correlate with the exposure levels.

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