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2%), removal of scaffold or safety guard in benzene column (18.2%), draining or cleaning in reactors, vessels and heat exchangers (12.1%), checking of pump and gauge pressure (9.1%), chemical make-up and maintenance of rotating motors (6.1%), etc. The results presented here are based on the large-scale study in Korea to examine the characteristics of benzene exposure in plant workers during TAs. The LTEC of benzene in the work sites was 0.024?ppm, which was only 2.4% of the 8-hr TWA (1.0?ppm). However, 20 cases (4.0%) exceeded the OELs in some occupations, with the rate decreasing in the order of plumbers, mechanical engineers, field men, welders, drain fitters, and scaffold workers [http://www.selleckchem.com/products/ABT-888.html Veliparib nmr] (p [http://www.selleckchem.com/products/Fulvestrant.html Fulvestrant] samples exceeding the OELs of the LTEC of benzene decreased in the order of the shut-down, maintenance, and start-up stages (p [http://en.wikipedia.org/wiki/RRAD RRAD] this study applied a job-based sampling strategy and an individual-based sampling strategy based on the tasks for each job category. According to the analysis of occupational health statistics (Data Base) of KOSHA from 2005 to 2007, benzene was handled at 555 work sites, excluding gas stations. In 2007, 1,291 samples were examined and benzene concentration was 0.197 �� 0.274?ppm (AM �� SD) and 0.099 (3.515) ppm (GM (GSD)). In 2006, the results of 650 samples were 0.300 �� 0.253?ppm and 0.130 (3.496) ppm, respectively. In 2005, the results of 1,152 samples were 0.178 �� 0.222?ppm and 0.091 (3.734) ppm, respectively. For the overall distribution of the benzene concentration from 2005 to 2007, over 90% of the total samples were below 0.5?ppm and rate for exceeding the OELs was only 0.1-0.5% [17]. Kang and colleagues [18] examined 174 samples from 2002 to 2005 from workers who handled benzene in factories and reported an exposure concentration of benzene in working environments of 0.229 �� 0.471?ppm. Among their samples, 9 showed a TWA benzene concentration higher than 0.5?ppm and 5 exceeded the OELs.