Exposure to benzene has been monitored in petrol-pump workers and dry cleaners of Meerut City (India) by measuring phenol content of their urine samples. Average values for phenol in urine were higher in petrol-pump workers than dry cleaners. Alcoholic subjects excreted more phenol than smokers and non-vegetarians. It is concluded that alcohol can alter the susceptibility of man to benzene toxicity by affecting its metabolism.