Abstract
The concentration of benzene, toluene, m-xylene and o-xylene in exhaust gases of passenger cars and in city air were investigated. The mean emissions of aromatic compounds from 31 cars subjected to a total of 107 ECE 15 test drives were: benzene 250± 100, toluene 350± 130, m-xylene 220±95 and o-xylene 95± 40 mg km −1. The results showed that 3–4 % of the aromatic compounds of the fuel were expelled unburnt with the exhaust gases. The corresponding concentrations of these aromatic compounds in city air during peak traffic periods (prevailing concentrations of carbon monoxide 10 ppm) were 100,140.60 and 30 μg m −3.
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