Benzene occurs naturally in crude oil, and so people working in associated industries may be exposed (including small concentrations in petrol).
Harm can be caused by inhalation of vapour, contact with skin or ingestion. Symptoms include headache, tiredness, nausea and dizziness; and unconsciousness if high concentration. Over longer term, serious blood disorders such as anaemia and leukaemia (form of cancer) can occur.
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