Abstract
The study was conducted to assess the health risks of workers due to exposure to toxic gases including benzene, toluene, ethylbenzene, m, p-xylene, o-xylene, formaldehyde and acetaldehyde at gasoline retail stations. In this study, data on the concentrations of the toxic gases were collected from the previously published studies in the qualified scientific journals. The health risk assessment was followed by the process of the United States Environment Protection Agency (U.S. EPA). The results show that the concentrations of benzene, toluene, ethylbenzene, m, p-xylene, o-xylene, formaldehyde, and acetaldehyde were in the range of 12.40 - 357.5, 12.47 - 574.17, 2.05 - 156.5, 4.57 - 218, 2.36 - 77.04, 3.64 - 153.93 and 1.27- 27.83 µg/m3 , respectively. Life time cancer risk for gasoline station workers due to exposure to benzene, ethylbenzene, formaldehyde, and acetaldehyde was calculated in the ranges of 2.13x10-5 - 6.14x10-4 , 4.96x10-7 - 3.79x10-5 , 4.81x10-6 - 2.03x10-4 , and 7.99x10-7 - 1.75x10-5 , respectively. For non-carcinogenic compounds, the hazard index due to benzene, toluene, m, p-xylene, o-xylene were respectively in the range of 0.13 - 3.81, 7.97x10-4 - 0.04, 0.01 - 0.70 and 0.01 - 0.25. The findings revealed that there is high risk of cancer and non-cancer for the workers working at the gasolines stations if they are not taking good preventive measures. The calculation showed that the limit levels of benzene, toluene, ethylbenzene, xylene, formaldehyde and acetaldehyde should be reduced to 5.82x10-4 , 15.64, 4.13x10- 3 , 0.31, 7.57x10-4 and 1.59x10-3 mg/m3 , respectively to meet the safety levels for the workers at the gasoline stations. 
 Keywords: benzene, toluene, ethylbenzene, xylene, formaldehyde, acetaldehyde, life-time cancer risk, health
Highlights
Pollution of BTEX and carbonyl compounds in the air is a common problem and has been received much attention since BTEX and carbonyl compounds are mutagenic or carcinogenic (Possanzini et al, 2002)
Compared with the limit value of the chemicals in the working air according to Decision No 3733/2002/QD-BYT, the concentration of benzene surveyed was within the permitted limit (
The mean concentration of toluene in the air in Bangkok was 302.64 μg/m3 which is higher than the average concentration of benzene (166.23 μg/m3), m, p-xylene (111.27 μg/m3), ethylbenzene (44.72 μg/m3) and o-xylene (38.83 μg/m3) (Kitwattanavong, 2010)
Summary
Data collection: In this study, concentrations of BTEX, formaldehyde and acetaldehyde at the gasoline stations were extracted from the the published papers for estimating health risk.
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