Research Article, Issue 1 Analytical Methods in Environmental Chemistry Journal Journal home page: www.amecj.com/ir AMECJ ------------------------ 1. Introduction In recent decades, the various pollutants are being detected in urban areas which are mainly caused by fossil fuel components. They include a wide spectrum of hydrocarbons. The aromatic hydrocarbons are either bio-chemically or biologically active and are potentially carcinogenic or are by-products of benzene. Many of the recent researches indicate the adverse effects of benzene on human health. Although VOCs are quite important, there have been few studies conducted in this regard in Tehran metropolitan [1-2]. The main emphasis has been on measurement, monitoring and control of VOCs in the last 10 years. The concentration of hydrocarbons in Tehran is much higher than other cities in the world (the benzene and butadiene 1 & 3 levels in Tehran are 10 and 18 times the permissible standards). [2]. Amongst the hydrocarbons, benzene due * Corresponding Author. E-mail: mirzahosseini@gmail.com DOI: https://doi.org/10.24200/amecj.v2.i01.47 Seyed Alireza Hajiseyed Mirzahosseini a,* a Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran Environmental Health Analysis: Assessing the emission levels of benzene from the fuel tanks doors of the vehicles in Tehran city A R T I C L E I N F O: Received 16 Jan 2019 Revised form12 Feb 2019 Accepted 30 Feb 2019 Available online 19 Mar 2019 Keywords: Volatile Organic Compounds Benzene emission PhoCheck Domestic cars Analysis of benzene in Air A B S T R A C T In this study, 350 vehicles in 20 different models were examined in one of Tehran’s Automobile Technical Inspection Centers. The laboratory tests indicate that longtime exposure to benzene has destructive effects on the blood cells, especially the bone-marrow cells. The concentration levels of benzene caused by the emission of gasoline vapors from fuel tanks doors were measured by PhoCheck EX5000 during a 5 to 15-minute interval for each car. The results indicate that the concentration of benzene caused by the emission of gasoline vapors from the fuel tanks door of the domestic cars was 10 times higher than the imported cars. In most of the imported cars, the amount of benzene in the three measured areas was negligible. This is due to the use of new technology and adaptation of strict environmental standards by the manufacturing country. Analytical Methods in Environmental Chemistry Journal Vol 2 (2019) 49-54