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Objectives. To study environmental exposure to benzene as well as hematological effects of benzene exposure in taxi drivers. Background. Exposure to benzene has been associated with adverse health effects, including haematopoietic disorders. Methods. A retrospective cohort study was carried out from the beginning of April 2017, through the end of June 2018, on 280 taxi drivers (the exposed group) and 120 unexposed matched individuals (controls). The tools included a predesigned self‐administered questionnaire which contained questions about personal data (e.g., age, educational level, and smoking) and exposure data (e.g., duration and nature of exposure). Investigations involved complete blood count. Environmental studies for light‐chain aromatic hydrocarbons (BTEX components: benzene, toluene, ethylbenzene, and xylene) were done. Results. Mean values (ppm) of ambient concentrations of …