Four workers died after inhaling toxic fumes at a chemical godown in Surat district on Wednesday. The incident occurred at Mota Borsara village in Mangrol taluka when five workers were shifting drums of chemicals, said inspector J A Barot of Kosamba police station. The owner of the godown has been detained and a case under IPC section 304 (culpable homicide not amounting to murder) has been registered, police said.