"3 UK petrol contains on average between 2 and 3% benzene (diesel fuel has insignificant amounts). It is naturally occuring from the petroleum distillate and its presence is to maintain the octane rating. Small amounts are also produced when organic substances burn incompletely, for example, it is found in vehicle exhausts and cigarette smoke. Motor mechanics are, therefore, likely to be exposed to benzene when they carry out work on vehicle fuel systems, such as draining fuel tanks or changing or cleaning fuel pumps, and similar activities which could result in the inhalation of benzene vapour and/or absorption through the skin. Leaflet MSA 13 'Benzene and you' contains advice for employees about the health hazards from benzene.
HSE - Occupational exposure to benzene in MVR workshops
ok. i agree with that. but the article is not considering the alkylbenzenes (the “other benzene compounds” i said) that are as highly carcinogenic as benzene. but since alkylbenzenes are not as volatile, i agree, they aren’t so easy to breed and therefore not so bad.