Genotoxicity and cytotoxicity of the extracts from coal tar pitch fumes (ECTPF) were studied using human lymphocyte unscheduled DNA synthesis (UDS) test and human embryo lung fibroblastic cell transformation test. The results of UDS test showed that the ECTPF increased UDS value significantly with a does-response relationship. Median lethal concentration (LC59) to human lymphocyte cells is about 33.8μg/ml. The results of human embryo lung fibroblastic cell transformation test showed that the foci of cell mo...