Studies have also shown that benzene causes toxicity to the hematopoietic system and can cause leukemia. Benzene can reduce colony formation in white blood cell and granulocyte levels. This suggests that progenitor cells may be more sensitive to the hematotoxic effects of benzene than mature cells. After identifying a group of workers exposed to <1 ppm benzene, the team found that across multiple blood counts there was evidence of hematotoxicity across workers exposed to benzene levels less than 1 ppm (Qing, L. et al., 2004 December ). In conclusion, studies have shown decreases in levels of white blood cells, granulocytes, lymphocytes, B cells, and platelets with increasing benzene exposure. Benzene is used as a solvent, as an intermediate and as a fuel. Benzene is converted to ethylbenzene, then to styrene, and to the polystyrene shown in (Figure 3). Another use of benzene is in the preparation of phenol, aniline for dyes, and dodecyl benzene for detergents. One of the most common uses of benzene as an intermediate is in the production of other chemical compounds. These chemical compounds include drugs and lubricants, cumene (resins), and cyclohexane (nylon and synthetic fibers). Therefore benzene is present in all the plastic objects we use every day. Benzene is used as a solvent in resins, oils, plastics, greases and rubber. During tire and rubber production