Health Risk Assessment of Ambient Air Concentrations of Benzene, Toluene and Xylene (BTX) in Service Station Environments

International Journal of Environmental Research and Public Health

Benjamin Edokpolo¹  Qiming Jimmy Yu² 

[1] Griffith School of Engineering, Griffith University, Nathan Campus, Brisbane, Queensland, 4111, Australia;

关键词: exposure assessment;    service station;    health risk assessment;    hazard quotient;    cancer risk;    overall risk probability;   

DOI  :  10.3390/ijerph110606354

来源: mdpi

【 摘 要 】

A comprehensive evaluation of the adverse health effects of human exposures to BTX from service station emissions was carried out using BTX exposure data from the scientific literature. The data was grouped into different scenarios based on activity, location and occupation and plotted as Cumulative Probability Distributions (CPD) plots. Health risk was evaluated for each scenario using the Hazard Quotient (HQ) at 50% (C_EXP50) and 95% (C_EXP95) exposure levels. HQ₅₀ and HQ₉₅ > 1 were obtained with benzene in the scenario for service station attendants and mechanics repairing petrol dispensing pumps indicating a possible health risk. The risk was minimized for service stations using vapour recovery systems which greatly reduced the benzene exposure levels. HQ₅₀ and HQ₉₅ < 1 were obtained for all other scenarios with benzene suggesting minimal risk for most of the exposed population. However, HQ₅₀ and HQ₉₅ < 1 was also found with toluene and xylene for all scenarios, suggesting minimal health risk. The lifetime excess Cancer Risk (CR) and Overall Risk Probability for cancer on exposure to benzene was calculated for all Scenarios and this was higher amongst service station attendants than any other scenario.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.