Of a total of 528 729 workers exposed to benzene or benzene mixtures in China, 508 818 (96-23%) were examined. Altogether 2 676 cases of benzene poisoning were found, a prevalence of 0-51 %. A higher prevalence of benzene poisoning was found in the cities of Hangjou, Hefei, Nanjing, Shenyang, and Xian. The geometric mean concentration of benzene in 50 255 workplaces was 18 1 mg/m3 but 64-6% of the workplaces had less than 40 mg/m3. There was a positive correlation between the prevalence of benzene poisoning and the concentration in shoemaking factories. The prevalence of benzene induced aplastic anaemia in shoemakers was about 5 8 times that occurring in the general population. The results of this investigation show the need for a practicable hygiene standard to prevent benzene poisoning.
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